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Open Source Instant Messaging & Chat Software (2026)
Last updated: February 2026
13 software options
Sponsored
Connecteam
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Enhance employee management with the only all-in-one app
Basic - from $29/month (billed annually) or $35/month (billed monthly) Advanced - from $49/month (billed annually) or $59/month (billed monthly) Expert - from $99/month (billed annually) or $119/month (billed monthly)
Read more about Connecteam
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Cloud-based mobile and desktop messaging app for all devices
Read more about Telegram
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Customer service software for businesses of all sizes
Free - up to 3 users, forever! Express - $7/user/month billed annually Standard - $14/user/month billed annually Professional - $23/user/month billed annually Enterprise - $40/user/month billed annually A 15-day free trial is available.
Read more about Zoho Desk
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
A simple and secure way to connect your organization.
Standard: $0 USD (free) Advanced: $4 USD per person / month Enterprise: $8 USD per person / month Free for non-profits and educational institutions
Read more about Workplace from Meta
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Open source workplace messaging for web, PCs & phones
Team edition: $0 free forever Enterprise E10: $3.25 user/month billed annually Enterprise E20: $8.50/user/month
Read more about Mattermost
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Digital Workplace Software
eXo Platform Enterprise Edition plans: Professional: $5 / user / month (Starting at 100 users) Enterprise: $6 / user / month (Starting at 300 users) Ultimate: $6 / user / month (Starting at 600 users)
Read more about eXo Platform
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Cloud-based software for team collaboration & communication
Zoho Cliq offers three paid plans - Standard, Professional, and Enterprise. A free plan is also available.
Read more about Zoho Cliq
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
The Leading Enterprise Communication Hub
Rocket.Chat offers two pricing plans: Community: A free, self-managed plan designed for small teams. Enterprise: $7/user/month with a minimum of 25 users and $35/agent/month with a minimum of 5 agents.
Read more about Rocket.Chat
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Enterprise collaboration and online community software.
Zimbra Collaboration Server (ZCS) is sold per user mailbox in bundled packs of 25, 250 and 2,500. Packs are available as annual, multi-year and perpetual software licenses. Open Source Edition Zimbra Open Source Edition is a free email and collaboration solution ideal for individuals or smaller organizations that do not require Zimbra Support, advanced administration, business continuity and only IMAP email on desktops and devices. Special discounts are available for government, education and non-profit organizations.
Read more about Zimbra Collaboration Suite
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
The most secure collaboration platform.
Read more about Wire
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Secure and privacy-compliant business messenger
Read more about Threema Work
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Online groupware and collaboration software
Try the free-of-charge on-premises for up to 10 users or two-month Trial SaaS version. On-premises version: TeamWox is free for up to 10 users, up to 25 users - 3 400 USD, up to 50 users - 6 700 USD, unlimited - 10 000 USD. SaaS version: Request a free two-month version of TeamWox. At the end of the trial period, you will be able to extend your subscription. The cost is $15 per user per month.
Read more about TeamWox
