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SUM - Secure Ultimate Messenger Alternatives

SUM - Secure Ultimate Messenger is described as 'SUM is a simple secure desktop instant messenger for local networks. No server infrastructure is needed. All communication is encrypted and nothing saved on any server' and is an app. There are more than 10 alternatives to SUM - Secure Ultimate Messenger for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet. The best alternative is LAN Messenger, which is both free and Open Source. Other great apps like SUM - Secure Ultimate Messenger are Feem, Winpopup LAN Messenger, Squiggle and Lan Messenger (outdated).

SUM - Secure Ultimate Messenger alternatives are mainly Instant Messengers but may also be Group Chat Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of SUM - Secure Ultimate Messenger.
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  • FreeOpen Source
  • Windows

SUM is a simple secure desktop instant messenger for local networks. No server infrastructure is needed. All communication...

Learn more about SUM - Secure Ultimate Messenger

  1. LAN Messenger icon

    LAN Messenger

    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • PortableApps.com

    LAN Messenger is a p2p chat application for intranet communication and does not require a server. A variety of handy features are supported including notifications, personal and group messaging with encryption, file transfer and message logging.

    ⚫︎ PortableLAN Messenger can be used from a USB stick or similar with no prior installation.
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    Discontinued

    Sadly, no more releases since Dec. 2018

    Screenshot
  2. Feem icon

    Feem

    • FreemiumProprietary
    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • Windows Phone
    • iPad

    Share files offline. No servers. No cloud. No limits.

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    Screenshot


  3. Winpopup LAN Messenger icon

    Winpopup LAN Messenger

    • Free PersonalProprietary
    • Windows

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

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    Screenshot
  4. Squiggle icon

    Squiggle

    • FreeOpen Source
    • Windows

    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 LAN.

    ⚫︎ PortableSquiggle can be used from a USB stick or similar with no prior installation.
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    Screenshot
  5. Lan Messenger (outdated)

    • FreeOpen Source
    • Mac
    • Windows
    • Linux

    LAN Messenger is a decentralized UDP IM-style chat client which supports usernames, guaranteed-delivery IMs, broadcast chat, encryption, file transfer, simple UI, persistent settings, and IP blocking.

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    Discontinued

    And almost as outdated as the original Lan Messenger. Last repo update from 2013.

    Screenshot


  6. AChat icon

    AChat

    • FreeProprietary
    • Windows

    AChat enables you to chat on your local network (LAN). But you can also share entire directories or send specific files, show images to other users and send messages even to users who are currently offline. Everything with full Unicode support.

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    No screenshots yet
  7. Output Messenger icon

    Output Messenger

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Self-Hosted

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

    ⚫︎ Screen SharingYou can use Output Messenger to share your screen with your colleages or friends.
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    Screenshot
  8. BigAnt Office LAN Messenger icon

    BigAnt Office LAN Messenger

    • Windows

    BigAnt Office LAN Messenger offers rich features for secure and stable business communication.

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    Screenshot
  9. Softros LAN messenger icon

    Softros LAN messenger

    • Mac
    • Windows
    • Android
    • Android Tablet

    Is your company starting to experience communication problems? Does it take too much time to call your co-workers to invite them to a group meeting? Hate walking all over the building to solve some trivial issue?

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    Softros LAN messenger main window
  10. RealPopup LAN chat icon

    RealPopup LAN chat

    • Mac
    • Windows
    • Android
    • Android Tablet

    Intra-office communication is essential to modern businesses; you need to be able to call your employees to meetings or update a project group quickly, easily and securely.

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    Screenshot
Showing 10 of 10 alternatives