Company lists · Data refreshed September 2026

Top 25 Open source marketing agencies worldwide

Name: Open source marketing agencies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 45,501 companies tracked

RevenueBase identified 45,501 company matches for open source marketing agencies worldwide as of September 2026 and tracks 262,763 professional contacts across them, including 51,750 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for open source marketing agencies worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 29, 2026. Country and city lists for open source marketing agencies follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 29, 2026 How this list was built

45,501Companies

262,763Contacts tracked

51,750Verified emails

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The 25 largest open source marketing agencies worldwide

Ranked by team size

Top 25 of 45,501 company matches for open source marketing agencies worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	IO	Exact match	Herentals, BelgiumHQ recorded Sep 29, 2026	1,001-5,000	3,670 contacts →
	Exact match “iO is an AI-native partner in marketing and technology, with experts across 12 campuses in Belgium, the Netherlands, Sweden, Denmark and Bulgaria.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
2	Digitas North America	Exact match	Boston, MA, United StatesHQ recorded Sep 29, 2026	1,001-5,000	2,654 contacts →
	Exact match “Digitas is the Networked Experience Agency, built on the vision that we create magnetic experiences that earn the right for brands to exist in human networks.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
3	Informal	Exact match	GreeceHQ recorded Sep 29, 2026	5,001-10,000	1,802 contacts →
	Exact match “informal is a company based out of Greece.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
4	SMILE	Exact match	Asnières Sur Seine, FranceHQ recorded Sep 29, 2026	1,001-5,000	1,352 contacts →
	Exact match “We are Technology experts & Business partners.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5	Brasil Monks	Exact match	São Paulo, BrazilHQ recorded Sep 29, 2026	1,001-5,000	963 contacts →
	Exact match “Media.Monks, the digital-first operating brand of S4Capital plc, connects content, data & digital media and technology services across one global team built from the bottom up.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
6	IVE Group	Exact match	Sydney, AustraliaHQ recorded Sep 29, 2026	1,001-5,000	860 contacts →
	Exact match “IVE Group is Australia’s largest diversified marketing company.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
7	Vertis Communications	Exact match	Sussex, WI, United StatesHQ recorded Sep 29, 2026	10001+	605 contacts →
	Exact match “Vertis Communications was acquired by Quad/Graphics in January 2013.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	Nobody	Exact match	Washington, NC, United StatesHQ recorded Sep 29, 2026	n/a	468 contacts →
	Exact match “NOBODY® is a social-first agency built for complex challenges, serving leading brands, nonprofits, and the Fortune 500.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9	Avatar	Exact match	Caba, IndiaHQ recorded Sep 29, 2026	51-200	412 contacts →
	Exact match “About us Avatar is an independent digital agency.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
10	LA Familia	Exact match	Santiago, ChileHQ recorded Sep 29, 2026	51-200	395 contacts →
	Exact match “Somos una Agencia de publicidad y marketing.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
11	Team Pumpkin	Exact match	Bengaluru, IndiaHQ recorded Sep 29, 2026	201-500	391 contacts →
	Exact match “We are a 300+ member Digital Agency with offices in Bangalore, Mumbai, Gurugram, Kolkata, Goa & Toronto, offering integrated services to enterprises and brands.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
12	Cognus Technology	Exact match	Udaipur, IndiaHQ recorded Sep 29, 2026	201-500	365 contacts →
	Exact match “Cognus Technology is an innovative digital marketing agency which has expertise and experience based throughout the whole marketing spectrum.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
13	Laboratory	Exact match	Toronto, ON, CanadaHQ recorded Sep 29, 2026	n/a	355 contacts →
	Exact match “We develop strategic, creative solutions that aren’t afraid of challenging tradition, because the way we see it – great marketing shouldn’t have to feel like marketing.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14	ZITEC	Exact match	Bucharest, RomaniaHQ recorded Sep 29, 2026	201-500	353 contacts →
	Exact match “Founded in 2003, Zitec is the trusted catalyst for bold organizations that want to achieve sustainable and significant results powered by technology.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15	Regicom	Exact match	Paris, FranceHQ recorded Sep 29, 2026	201-500	332 contacts →
	Exact match “REGICOM : 50 ans d’audace et d’innovation au service de la communication digitale locale!” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16	DDB Paris	Exact match	Paris, FranceHQ recorded Sep 29, 2026	201-500	332 contacts →
	Exact match “DDB Paris, c'est 350 personnes de talents, d'horizons et de cultures diverses, de très belles marques, et des récompenses significatives.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
17	Gozoop Group	Exact match	Mumbai, IndiaHQ recorded Sep 29, 2026	51-200	332 contacts →
	Exact match “Founded in October 2008, Gozoop is an independent marketing company offering a wide range of strategic solutions for brands and businesses.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18	Tattoo Projects	Exact match	Charlotte, NC, United StatesHQ recorded Sep 29, 2026	n/a	323 contacts →
	Exact match “Bending rules.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	Cramer-Krasselt	Exact match	Chicago, IL, United StatesHQ recorded Sep 29, 2026	201-500	299 contacts →
	Exact match “Cramer-Krasselt is one of the largest independent agencies in the US with nearly $50 million revenue, with more than 80% of that revenue coming from digital and social.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
20	ADD People	Exact match	Altrincham, United KingdomHQ recorded Sep 29, 2026	201-500	292 contacts →
	Exact match “We’re Add People, a team of digital marketing professionals dedicated to helping small to medium-sized businesses grow online.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	DWA	Exact match	San Francisco, CA, United StatesHQ recorded Sep 29, 2026	51-200	290 contacts →
	Exact match “Merkle \| DWA is a global media and marketing agency for technology companies.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22	Drive Social Media	Exact match	Saint Louis, MO, United StatesHQ recorded Sep 29, 2026	201-500	284 contacts →
	Exact match “Drive Social Media takes a holistic approach to designing strategies for our clients.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23	KAN Agency	Exact match	Malmö, SwedenHQ recorded Sep 29, 2026	51-200	278 contacts →
	Exact match “One of Sweden’s largest digital communications agencies, KAN boasts over 100 specialists in the areas of strategy, concept, UX, design, copywriting, film, social media, technical…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
24	Edison	Exact match	Heverlee, BelgiumHQ recorded Sep 29, 2026	n/a	273 contacts →
	Exact match “we are there now.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
25	Medier Agency	Exact match	United StatesHQ recorded Sep 29, 2026	51-200	270 contacts →
	Exact match “Medier is more than just a marketing agency.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “open source marketing agencies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 45,501 open source marketing agencies worldwide

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Open source marketing agencies worldwide at a glance

As of Sep 29, 2026

19.7%Verified-email coverage

5.8Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

32,485

11-50

11,415

51-200

1,264

201-500

209

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for open source marketing agencies are linked below.
What qualifies: Company records worldwide whose business descriptions match “open source marketing agencies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 51,750 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 29, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Open source marketing agencies by location

201 lists · largest first

Every Open source marketing agencies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “open source marketing agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many open source marketing agencies are there worldwide?

RevenueBase identified 45,501 company matches for open source marketing agencies worldwide as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

IO tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most open source marketing agencies?

The United States leads with 7,779 companies, followed by India (3,837) and Brazil (2,606). Every open source marketing agencies list by country and city is linked on this page.

Which city has the most open source marketing agencies?

London leads with 743 company records, followed by Sao Paulo (545) and Dubai (478).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 51,750 professional contacts with verified work emails tracked across these 45,501 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.