Outpost

Download Outpost

The native desktop app for Windows, macOS, and Linux. You'll still need an Outpost server to connect to — either join one from the directory or run your own.

These installers are unsigned. Outpost is a personal project without a paid Apple Developer membership or Windows code-signing certificate, so Windows SmartScreen and macOS Gatekeeper will both warn on first run. That's a real limitation of not paying for signing, not a broken build. See the workaround for each OS below, and the support page if you'd like to help change this.
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macOS: "Outpost is damaged and can't be opened"

This is macOS Gatekeeper reacting to an unsigned, unnotarized app — not a corrupted download. Open a terminal and run:

xattr -cr /Applications/Outpost.app

That clears the quarantine attribute Gatekeeper checks, and the app opens normally after that.

Windows: "Windows protected your PC"

This is SmartScreen reacting to an installer with no code-signing certificate behind it — again, not a broken build. Click More info, then Run anyway.

Auto-updates

Windows and Linux builds auto-update in place via GitHub Releases. macOS builds currently can't auto-update — Apple requires a signed build for that too — so re-downloading a new .dmg from this page is the way to update on Mac for now.