https://github.com/Zankoku-Okuno/octopus
Features
Executive summary: it's a Lisp with first-class-everything. For more detail, it has:
Code is data/Data is code: Write programs to write your programs for you; eradicate boilerplate.
Vau operator: You control when arguments get evaluated; mix and match lazy and strict.
First-class environments: You decide what's in scope and what isn't.
Immutable values: Data structures are default persistent; never corrupt your program state again.
First-class control: Conquer the last resistance to abstraction; define any control flow construct ever dreamt of.
Streamlined syntax: With only eight grammar rules, you might miss them if you blink.
Permissive identifiers: Unicode identifiers and user-defined disfixes open new possibilities; make Lisp read/write.
Natural concurrency: Any concurrency model can be implemented as a library; tame the multiprocessing beast.