Hello, I'm the developer of Turbo/64, a new BBS software package for the Commodore 64. It's SUPER early days and far from a v1 release, but it's available on Github and the latest release is v0.3.1.
It's being written in C for the Oscar64 compiler. It targets native .prg output for real hardware (including C64 Ultimate) and VICE emulation.
I'm considering an "Ultimate" version that's targeted at running on the c64u's Software IEC, but that means no REL database files, so there's some experimentation to be done. Right now, it does take advantage REU and Realtime clocks, and there's a rudimentary door development library (C). Tested with partitions on uIEC/SD device on the Ultimate as well.
Anyway, I met some kind folks on the Turbo/64 Discord channel and thought I'd say hi here!
Cheers.