ProtonSync enables synchronization of Proton Contacts and Calendar with Android native applications, offering an open-source and free solution.
Elm-CRDT is a Pure-Elm library implementing Conflict-Free Replicated Data Types, enabling concurrent editing with automatic convergence regardless of merge order or decentralization. It supports multiplayer collaboration, offline capability, complete edit history, and features like delta sync, collaborative text via Fugoe, and rich text via Peritext.
SpaceTimeDB is a reactive backend platform that combines database, server logic, authentication, and real-time sync in one unified system, eliminating the need for separate web servers, ORMs, or microservices. Designed for AI agents and game developers, it allows code to run directly inside the database in Rust, C#, or TypeScript, providing automatic client synchronization and simplified deployment.
ZestSSH is a cross-platform SSH client for Android, iOS, Windows, macOS, and Linux that offers end-to-end encrypted sync, server monitoring, and smart connection routing. The creator initially built it as a capstone project, and it has evolved into a paid application with optional hosted storage, following a one-time purchase model with no subscriptions.