Alternatives to SUM - Secure Ultimate Messenger for all platforms with any license





Web / Online

Other Platforms

  • LAN Messenger icon

    LAN Messenger

    LAN Messenger is a p2p chat application for intranet communication and does not require a server. A variety of handy features are...

    Open Source Mac Windows Linux

  • Winpopup LAN Messenger icon

    Winpopup LAN Messenger

    Winpopup LAN Messenger is a cost-effective Office, Corporate, Enterprise Instant Messaging solution.

    Free Personal Windows

  • Squiggle icon


    Squiggle is a free server-less peer to peer LAN messenger. Just download and run it and you're ready to talk to everyone on your...

    Open Source Windows

  • Output Messenger icon

    Output Messenger

    Private and Secure Instant Messenger for Office designed specifically for keeping remote employees and multiple offices in sync. ...

    Commercial Mac Windows Linux Android iPhone Self-Hosted

  • BigAnt Office LAN Messenger icon

    BigAnt Office LAN Messenger

    BigAnt Office LAN Messenger offers rich features for secure and stable business communication. Including instant messaging, group...

    Commercial Windows

  • Softros LAN messenger icon

    Softros LAN messenger

    Local instant messaging application for an office chat, messages broadcast and files transfer.

    Commercial Mac Windows Android Android Tablet

  • Lan Messenger

    LAN Messenger is a decentralized UDP IM-style chat client which supports usernames, guaranteed-delivery IMs, broadcast chat...

    Open Source Mac Windows Linux

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