hyx, a minimalistic (< 2300 lines of C) but powerful (hex/ASCII, insert/replace/delete, copy/paste, undo/redo, search, colors, vim-inspired controls) terminal hex editor (current version 2024.02.29).
ynetd, a small (< 400 lines of C) server for binding programs to TCP ports (current version 2024.02.17).
see also here for a hardened version.