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Open Source Instant Messaging & Chat Software

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Telegram logo
4.7
(6.2K)

Cloud-based mobile and desktop messaging app for all devices

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Open Source
Telegram is a free messaging app with no ads or subscription fees.

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Zoho Desk logo
4.5
(2.1K)

Superior customer service. Lasting experiences.

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Open Source
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.

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Workplace from Meta logo
4.4
(1.3K)

A simple and secure way to connect your organization.

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Open Source
Standard: $0 USD (free) Advanced: $4 USD per person / month Enterprise: $8 USD per person / month Free for non-profits and educational institutions

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Connecteam logo
4.8
(325)

Enhance employee management with the only all-in-one app

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Open Source
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)

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Mattermost logo
4.4
(151)

Open source workplace messaging for web, PCs & phones

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Open Source
Team edition: $0 free forever Enterprise E10: $3.25 user/month billed annually Enterprise E20: $8.50/user/month

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eXo Platform logo
4.6
(116)

Digital Workplace Software

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Open Source
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)

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Rocket.Chat logo
4.3
(149)

The Leading Enterprise Communication Hub

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Open Source
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.

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Zoho Cliq logo
4.6
(85)

Team communication software

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Open Source
Zoho Cliq offers three paid plans - Standard, Professional, and Enterprise. A free plan is also available.

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Zimbra Collaboration Suite logo
4.4
(91)

Enterprise collaboration and online community software.

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Open Source
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.

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Wire logo
4.5
(69)

The most secure collaboration platform.

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Threema Work logo
5.0
(8)

Secure and privacy-compliant business messenger

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TeamWox logo
5.0
(1)

Online groupware and collaboration software

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Open Source
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.

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Threema OnPrem logo
(0)

Threema OnPrem is a self-hosted business messaging solution.

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