1. Siren[status: superseded by Purr] Sirën is an experimental context-based programming language with ad hoc multiple hierarchies, and multimethods.
2. Raven(hiatus) Raven is a minimal, distraction-free text editor with good typography.
3. tamago(superseded by: https://github.com/qteatime/crochet) A safe, extensible, layered programming language that runs on top of JavaScript
4. furipota(unmaintained) A discrete FRP DSL for describing better build pipelines.
5. metamagical(unmaintained) Meta:Magical allows you to annotate objects in JavaScript, and inspect them in an interactive environment (REPL).
6. effects(experiment) Composable effects with one-shot continuations for JavaScript!