A very simple functional programming language I made to not get scared about FP just because of Haskell's scary symbols. It also has I/O, see the smallfuck example for a demo.
cargo install --git https://github.com/pro465/rhokell
echo "(hello) = (world);" > hello_world.rhk
echo "(hello)" | rhokell -r hello_world.rhkYou should see (world) getting output on the REPL.
The Esolangs entry has more information.
all files in ./examples are available under public domain, while the interpreter is licensed under GPLv3.0