
--
Zulip, open source Slack competitor, is relaunching after being aquired by Dropbox, Zulip 3.0. Current customers include hundreds of startups and large companies from Akamai Tech to Doctors on Demand and even Alcoholics Anonymous. It has the most active open source contributors in the space today compared to any competitor.
Zulip was sold to Dropbox while still in private beta and then Dropbox let Tim Abbot have it back after releasing it as an open source project.
Original startup's founders are Tim Abbott (Kandra Labs / Zulip founder), with Jeff Arnold, Jessica McKellar, and Waseem Daher were his cofounders. Today, they are the founders of Pilot (https://www.indexventures.com/perspectives/pilotcom-raises-40m-in-series-b-funding-and-launches-pilot-tax/).
Zulip's original 2012-2014 startup angel investors (2013) are Drew Houston (founder of Dropbox), Adam d'Angelo (Facebook's first CTO and now founder and CEO of Quora), Diane Greene (cofounder and CEO of VMWare, later CEO of Google Cloud), Paul English (founder of Kayak), Hans Robseron and Sanjit Biswas (cofounders of Meraki), Dharmesh Shah (cofounder of AngelList), Howard Lerman (founder and CEO of Yext), Enrique Salem (CEO of Symantec at the time), and SV Angel.
Zulip was then Acquired by Dropbox in 2014, while in private beta, then given back to founder. At that time Zulip became open source. Most Zulip beta customers tried switching to Slack, and then switched back to Zulip as they found it more productive (despite being a beta that was no longer developed). Dropbox decided not to pursue the team chat market, and Dropbox's legal/engineering leadership then decided to donate the software to the open source community. A dozen engineers flew to Dropbox HQ for a week to help with the engineering work of making it possible to open source Zulip. Dropbox generously donated the Zulip trademark and zulip.com/zulip.org domains.
While there are several open source projects in the team chat space, Zulip has by far more significant contributors than any of the others. Total contributors is a vanity metric; because fixing a typo via the GitHub website counts, it's inflated and doesn't give a useful picture of the breadth of a project's community. The right statistic is how many significant contributors there are - people with dozens or 100 commits ( commits are individual code contributions).
For comparison these are the other major open source team chat projects:
Mattermost: https://github.com/mattermost/mattermost-server/graphs/contributors shows 21 contributors with 100 contributions. This includes fulltime employees for their venture-funded company.
Rocket.Chat: https://github.com/RocketChat/Rocket.Chat/graphs/contributors shows 15 contributors with 100 contributions. This includes fulltime employees for their venture-funded company.
Matrix.org: https://github.com/matrix-org/synapse/graphs/contributors shows 13 contributors with 100 contributions. This includes fulltime employees for their venture-funded company.
###
Most recent headlines
05/01/2027
Worlds first 802.15.4ab-UWB chip verified by Calterah and Rohde & Schwarz to be ...
01/06/2026
January 6 2026, 05:30 (PST) Dolby Sets the New Standard for Premium Entertainment at CES 2026
Throughout the week, Dolby brings to life the latest innovatio...
02/05/2026
Dalet, a leading technology and service provider for media-rich organizations, t...
01/05/2026
January 5 2026, 18:30 (PST) NBCUniversal's Peacock to Be First Streamer to ...
01/04/2026
January 4 2026, 18:00 (PST) DOLBY AND DOUYIN EMPOWER THE NEXT GENERATON OF CREATORS WITH DOLBY VISION
Douyin Users Can Now Create And Share Videos With Stun...
26/03/2026
Extron and Audio-Technica have announced that their Design Solutions devices, Ce...
26/03/2026
SPORTEL Asia took place March 24-25 at the Orchard Hotel Singapore, drawing 370 participants representing more than 220 companies from 35 countries. Approximate...
26/03/2026
LTN will demonstrate satellite-to-IP migration solutions for broadcasters, cable networks, MVPDs, and station groups at NAB Show 2026 (Booth W2100).
The C-Ban...
26/03/2026
The Seattle Mariners have partnered with Daktronics to install an upgraded outfi...
26/03/2026
The Esports Foundation (EF) has awarded National Team Partner status to organizations and individuals across more than 100 countries and territories for the Esp...
26/03/2026
Telestream has announced expanded integration between its Vantage workflow platf...
26/03/2026
FOR-A Corporation has announced a partnership with Nippon TV and NVIDIA to distr...
26/03/2026
CBS Sports and the WNBA have expanded their partnership through a new long-term, multiplatform rights agreement. CBS Sports will feature up to 20 regular-season...
26/03/2026
Zac Brown Band will star in the Sunday Night Baseball show open on NBC and Peacock, NBC Sports announced. The open was filmed at American Family Field, home of ...
26/03/2026
Major League Baseball opens the 2026 season with nationally televised games across multiple media partners. Fans can visit MLB.com/Watch for a complete schedule...
26/03/2026
DIRECTV has announced an agreement to carry nine new MLB-operated team channels, covering the Cincinnati Reds, Detroit Tigers (Detroit SportsNet), Kansas City R...
26/03/2026
Nationals.TV, the Washington Nationals' local broadcast channel, is now avai...
26/03/2026
Starting Thursday, March 26, MLB.TV will be available on the ESPN App, giving fans access to more than 2,000 out-of-market regular season games. Fans can also r...
26/03/2026
Spotify's partnership with NAVER, Korea's leading digital platform, is built around one simple goal: making it easier for listeners in Korea to discover...
26/03/2026
Exclusive to ComposerCloud for first month
Sample library and virtual instrument gurus EastWest have announced the upcoming release of a new virtual drum i...
26/03/2026
Friday 27 March
Friday 27 March will mark Dynamic Range Day 2026, the annual day of online activity that was started in 2010 by mastering engineer Ian Sheph...
26/03/2026
Includes four separate instruments
Max Richter's SRM Sounds venture have just announced their fifth release, ASMR Choir. Captured at the main live room ...
26/03/2026
The National Film and Video Foundation (NFVF), an agency of the Department of Sport, Arts and Culture (DSAC), has been tasked with administering the Sixth Presi...
26/03/2026
By Matt Klein
Hello to everyone reading this - whether you're a current YEP, HPA member, or just YEP-curious. I'm Matt Klein, one of the co-chairs of t...
26/03/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
26/03/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
26/03/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
26/03/2026
28 participating companies, from start-ups to blue-chips, lead the UK Group as part of the GREAT Britain and Northern Ireland presence across all the Halls at N...
26/03/2026
Arkona Unveils BLADE//planner and Major Usability Enhancements at NAB 2026
Brie Clayton March 26, 2026
0 Comments
New graphical configuration tool and...
26/03/2026
Bitfocus showcases complete control at NAB Show 2026
Brie Clayton March 26, 2026
0 Comments
Continuing development drives advances in security, availa...
26/03/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
26/03/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
26/03/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
26/03/2026
Share
Copy link
Facebook
X
Linkedin
Bluesky
Email...
26/03/2026
Nevion introduces powerful new Panel Builder to enhance VideoIPath broadcast con...
26/03/2026
2026 Oscar Nominated Films Powered by Blackmagic Design
Brie Clayton March 25, 2026
0 Comments
DaVinci Resolve Studio used on 27 of this year's no...
26/03/2026
Leader to present full suite of advanced Test & Measurement solutions at NAB Sho...
26/03/2026
Boston Conservatory to Present New England and Collegiate Premiere of Groundbrea...
26/03/2026
Thursday 26 March 2026
HBO Max included for Sky and NOW customers from 26 March...
26/03/2026
Thursday 26 March 2026
Sky Sets Iconic Costumes Dancing Together Like Never Before' in Brand CampaignTurn on cookies to view this content. Go to Privacy o...
26/03/2026
Wuppertal March 26, 2026
CS live Builds Future-Ready OB Van With Riedel MediorNet and hi Control SystemRiedel Communications today announced that Czech-based ...
26/03/2026
Back to All News
Have a Wish Worth Dying For? Netflix's First Korean YA Hor...
26/03/2026
Back to All News
The Truthers, Starring Jose Coronado and St phanie Magnin, Pre...
26/03/2026
Enhancements to Harmonic's Sports Streaming Solution Introduce Server-Side Multiview, Contextual Metadata-Driven Advertising, Dynamic In-Stream Ads and Robu...
26/03/2026
Open the report
Our 2025 report brings together results from 79 business magazine titles across 22 market sectors, published by 49 media owners. Over the year,...
26/03/2026
Editor's note: This post is part of Into the Omniverse, a series focused on ...
26/03/2026
RT Commercial today announced Fiat as sponsor of The Louise Duffy Show on RT Radio 1, Weekdays 3pm 4pm.
The Louise Duffy Show is the home of daytime music...
26/03/2026
That gaming backlog won't clear itself - GeForce NOW is here to help. Stream the latest titles straight from the cloud across a variety of devices.
This we...
26/03/2026
Wayne, N.J., March 26, 2026 Phantom High-Speed announces the latest product li...