MyDevTools

An all-in-one, offline-first developer toolkit desktop app with 80+ tools: formatters, converters, encoders, security and crypto utilities, generators, an API client with mock server and SQL/gRPC support, a data explorer, plus notes, bookmarks and tasks. Fully local: no accounts, no sign-in, no cloud sync, no telemetry beyond an opt-in anonymous ping. Data is stored on-device in an encrypted SQLCipher database. Free and open source under AGPL-3.0, shipped for macOS, Windows and Linux.