Tigger C is very close to C and generates efficient 6502 code: fast and compact. Tigger C is written in Hopper and takes advantage of the Hopper 6502 Assembly toolchain.
Tigger C documentation on GitHub:
https://github.com/sillycowvalley/Hopper/blob/main/Source/Languages/TiggerC/ReadMe.md
Samples shown in this video:
https://github.com/sillycowvalley/Hopper/tree/main/Source/Languages/TiggerC/Samples
Hopper releases on GitHub:
https://github.com/sillycowvalley/Hopper/releases/tag/v1.0.0.83