Nisper

Nisper 0.8.3 is an RPC library built on WebSocket and the nisp Lisp-like language. It enables bidirectional, script-based remote procedure calls between Node.js and browser clients. Key differentiators: composable function calls via nisp expressions, built-in Promise support, binary data via custom encoders (e.g., msgpack-lite), auto-reconnect, and same API for all directions. Development appears inactive since 2020; current version is stable but unmaintained.