
--
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 ...
10/11/2026
ENCO provided live stage captioning, multilingual translation and new audio pass-through services at NAB Show New York, held Oct. 21-22 at the Javits Center, an...
10/11/2026
Vizrt has built a proof-of-concept integration with the Story Object Model (SOM), shown at IBC 2026 in Amsterdam as part of the Smart Stories Accelerator projec...
10/11/2026
Gravity Media's Creative and Managed Services team produced a dedicated live 9:16 vertical broadcast workflow for Meta Connect 2026. Meta asked for more tha...
10/11/2026
Blue Stream Fiber has standardized its OTT streaming services on Ateme's end-to-end video platform for its high value linear channels, providing more effici...
10/11/2026
Haivision has opened the survey for its 2027 Broadcast Transformation Report, inviting broadcast, media, and production professionals worldwide to share their p...
10/11/2026
The League of Live Stream Theater (LOLST), the nonprofit organization partnering...
10/11/2026
USA Sports and The Horse Racing League (HRL) has announced a partnership to air ...
10/11/2026
Matrox Video has launched The Sync, a new video podcast series bringing together Matrox Video experts, customers, and partners to explore the technical and busi...
10/11/2026
The CW Network and Professional Bull Riders (PBR) have announced a new multi-yea...
10/11/2026
There is a certain irony that Chip Adams was turned down when he first looked in...
10/11/2026
Pliant Technologies' CrewCom Flex product line is now shipping in the United States. As a frameless matrix intercom system and complete matrix IP-based inte...
10/11/2026
PARK CITY, Utah (November 10, 2026) The Sundance Institute today announced the appointment of Allison Graff-Weisner as its new Chief Development Officer (CDO)...
10/11/2026
New tool humanises orchestral MIDI parts
Described as a session musician inside your DAW, VSL's latest plug-in aims to make quick work of making program...
10/11/2026
Free EQ launched alongside four major updates
PSPaudioware have just launched their latest free plug-in, along with a set of updates that bring modern OS co...
10/11/2026
Save 25% throughout November 2026
Following the recent release of Cubase 16, regular SOS contributor John Walden has announced that he will be running a 25%...
10/11/2026
Set to launch in early 2027
The latest version of Ableton's DAW software has just been unveiled, and will be making an official appearance in early 2027...
10/11/2026
IoT devices use a wide range of frequency bands below 6 GHz, from Sub-GHz LPWAN sensors to 5G and Wi-Fi systems. Lower frequencies such as 433 MHz, 868 MHz, 915...
10/11/2026
A ceramic patch GPS antenna may fit mechanically but still perform poorly if it is too small, incorrectly orientated, placed near noisy electronics or installed...
10/11/2026
A GPS antenna ground plane provides the conductive RF reference a ceramic GPS/GNSS patch needs, but that does not always mean the product PCB must provide it. T...
10/11/2026
An external GPS antenna is usually the better option when the product enclosure ...
10/11/2026
New R&S FNH combines spectrum analysis, vector network analysis and power meteri...
10/11/2026
eds3_5_jq(document).ready(function($) { $(#eds_sliderM519).chameleonSlider_2_1({...
10/11/2026
Buyers can now access custom CTV deals across on-demand and live content
NEW YORK, November 10, 2026 - Gracenote, Nielsen's content intelligence business, ...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Clear-Com supported On Air 2026, a 24-hour student-led broadcast connecting 45 universities across 30 countries. Using Station-IC virtual intercom panels, an ...
10/11/2026
Matrox Video today announced the launch of The Sync, a new video podcast series bringing together Matrox Video experts, customers, and partners to explore the t...
10/11/2026
Adobe Brings Agentic AI to the Content Supply Chain with CX Enterprise Coworker
Brie Clayton November 10, 2026
0 Comments
Adobe empowers brands to bui...
10/11/2026
Amplify Berklee Gala Raises More Than $1.3 Million for Berklee City Music Schola...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Grass Valley K-Frame switching and LDX cameras support live sports production at the Northwestern Wildcats' new stadium, providing a common technology platf...
10/11/2026
The League of Live Stream Theater (LOLST), the nonprofit organization partnering with theaters and producers to bring live theater to audiences worldwide throug...
10/11/2026
COW Jobs: Several remote positions at Chakrra
Brie Clayton November 10, 2026
0 Comments
Several remote positions at Chakrra
November 6, 2026COW Jobs...
10/11/2026
Blackmagic Design Unites Live Solutions for Reggae Land 2026
Brie Clayton November 10, 2026
0 Comments
Festival relies on ATEM Constellation 8K and UR...
10/11/2026
Where Video Editors Earn the Most and Where the Paycheck Goes Furthest
Mark Santos November 10, 2026
0 Comments
Sooner or later every editor asks what...
10/11/2026
Caroline Davis to Perform with Berklee Student Ensemble for Signature Series Con...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
Share
{alert(Link copied)}).catch(err => {console.error(Failed to copy: , err)}) data-platform=copy_link data-action= class=font-ui-heading py-2 text-sm tex...
10/11/2026
New Compact industry-standard Support Fits in the Trunk of a Small Car
Pioneering C-Stand innovator, Matthews Studio Equipment, introduces the 33 Sliding Leg...
10/11/2026
Following a decision by Magyar Telekom's Board of Directors, Tibor R kasi wi...
10/11/2026
Tuesday 10 November 2026
What happened to Amy? New true crime series, Don't...
10/11/2026
Key Takeaways
Quickline replaces legacy CMTS hardware with Harmonic's vir...
10/11/2026
Recording samples and making a holiday-themed soundtrack On a mission to record the next holiday hit, Focusrite product specialist, Alex sets off to record sa...
10/11/2026
Today, Apple announced a new accessibility feature for the Apple TV app that giv...