Company lists · Data refreshed September 2026

Top 21 Volunteer software development companies based in Kolkata, India

Name: Volunteer software development companies based in Kolkata, India
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 102 companies tracked

RevenueBase identified 102 company matches for volunteer software development companies associated with Kolkata, India as of September 2026 and tracks 1,006 professional contacts across them, including 196 with verified work emails. Across India, Ahmedabad is the largest hub for this category (435 companies); Kolkata has 102.

This list covers company matches for volunteer software development companies associated with Kolkata, India, 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.

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

102Companies

1,006Contacts tracked

196Verified emails

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The 21 largest volunteer software development companies based in Kolkata, India

Ranked by team size

Top 21 of 102 company matches for volunteer software development companies based in Kolkata, India, 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	Sentientgeeks	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	51-200	229 contacts →
	Exact match “Are you looking for professional & experienced offshore developers for promoting your brands digitally?” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
2	Fortmindz	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	51-200	71 contacts →
	Exact match “At Formindz we strive to offer you a broad experience with industry leading development practices and innovation.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
3	APT Software Avenues P LTD	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	51-200	49 contacts →
	Exact match “Apt Software is a boutique software development organization focussing on partnering and growing with technology startups.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
4	Webmaa	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	45 contacts →
	Exact match “Webmaa is your digital partner for innovative web, mobile, and cloud solutions.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5	Coders Mind Pvt. LTD	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	25 contacts →
	Exact match “We are a software development company based in Kolkata.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
6	Techwens	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	22 contacts →
	Exact match “Techwens is the best Custom Enterprise Software Development Services in India.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
7	Websadroit	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	21 contacts →
	Exact match “Websadroit is one of the leading web development companies in India, offering offshore web development services for all kinds of businesses.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	Bantech	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	18 contacts →
	Exact match “BANTECH is a leading brand in software and web development with a global presence.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9	Unnatim	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	501-1,000	17 contacts →
	Exact match “Unnatim India Limited is a Software company in India.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
10	Dotlinker	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	14 contacts →
	Exact match “We are a software development company offering extensible and end-to-end software solutions, mobile applications, web applications, AI-driven platforms, enterprise portals…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
11	Bizcommits	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	12 contacts →
	Exact match “We provide cutting edge Web and Mobile app solutions.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
12	Shreesols	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	12 contacts →
	Exact match “We are a global software development company in India offering powerful information technology solutions.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
13	AM Infosystems PVT LTD	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	12 contacts →
	Exact match “AM Infosystems (Previously known as AM-Soft) is a web development company Kolkata India.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14	Indiantech	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	8 contacts →
	Exact match “Indian Tech initiated with a simple, yet profound design i.e.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15	Capital Numbers Infotech Private Limited	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	201-500	5 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16	Advance Software Technologies Private Limited	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	5 contacts →
	Exact match “Give us an idea and we will deliver exactly what you ideated!” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
17	Shahidoon Softech Pvt. LTD	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	1-10	5 contacts →
	Exact match “We are a well growing, professionally managed Software Development start-up company providing excellent services to our clients all over the world.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18	Sensenet Technologies Pvt. LTD	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	4 contacts →
	Exact match “SenseNet Technologies is one of the leading innovative companies specializing in custom software development.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	Tebixa Technologies	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	2 contacts →
	Exact match “Tebixa™ Is the India's Most Fastest Growing Website Development Company With A Complete Services Of Website Development, Android & iOS Application Development, SEO Optimization…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
20	Deftidea	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	201-500	1 contacts →
	Exact match “recognized as a startup by the Department for Promotion of Industry and Internal Trade.** We provide custom development, Wordpress development, Production Support & Maintenance to…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	Creo Digital Group	Exact match	Kolkata, IndiaHQ recorded Sep 29, 2026	11-50	1 contacts →
	Exact match “CREO Digital Group is a Software Development and IT services company with 10+ years of experience in Custom Software development using technologies like Angular, Node, MongoDB…” 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 “volunteer software development companies”. 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 21 of 102 volunteer software development companies based in Kolkata, India

See the full list, filter by size, metro and specialty, and access 196 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Volunteer software development companies based in Kolkata, India at a glance

As of Sep 29, 2026

19.5%Verified-email coverage

9.9Average contacts per company

11-50Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole India list rather than for Kolkata, so it is reported there. Company counts and contact totals on this page are exact for Kolkata, over 102 companies.

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.
What qualifies: Company records associated with Kolkata, India whose business descriptions match “volunteer software development companies” 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 196 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.

Volunteer software development companies by metro in India

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 “volunteer software development companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many volunteer software development companies are there based in Kolkata, India?

RevenueBase identified 102 company matches for volunteer software development companies associated with Kolkata, India 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?

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

Which city in India has the most volunteer software development companies?

Ahmedabad leads India with 435 company records, followed by Pune (294) and Bangalore (256). Kolkata has 102.

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 196 professional contacts with verified work emails tracked across these 102 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.