Security Open Source Tools

Alternative toPermit.io

Open source authorization with RBAC, ABAC, and ReBAC for any app

• 3,488 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toHookdeck

Webhook platform with delivery guarantees, retries, and signing

• 3,457 GitHub stars
• MITLicence MIT

Alternative toDiscord

Self-hosted open source Discord alternative with servers

• 3,406 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toSlack

Self-hosted web-based XMPP chat client for any server

• 3,301 GitHub stars
• MPL-2.0Licence MPL-2.0
• #Chat

Alternative toNextDNS

Pi-hole-style DNS ad-blocker on a $2 ESP32-C3 board

• 3,299 GitHub stars
• MITLicence MIT

Alternative toAmazon S3

Decentralized S3 storage with end-to-end client-side encryption

• 3,282 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toMicrosoft Teams

End-to-end encrypted messaging, voice, and file sharing

• 2,781 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toThreema Work

Free encrypted P2P messaging and voice calls, no servers

• 2,696 GitHub stars
• GPL-3.0Licence GPL-3.0
• #Chat

Alternative toSlack

Peer-to-peer serverless chat app with no central server

• 2,659 GitHub stars
• GPL-3.0Licence GPL-3.0
• #Chat

Alternative toJEB Decompiler

Zero-overhead Android decompiler for mobile security researchers

• 2,510 GitHub stars
• Apache-2.0Licence Apache-2.0