The following software are known to use or support tcc builds.
Feel free to complete this list (*).

Name                   Short Description
bigz                   An infinite precision Z & Q library.
gawk                   GNU awk.
gnumake                GNU makefile.
mpv                    A free, open source, and cross-platform media player.
openlisp               ISLISP ISO/IEC 13816 Lisp interpreter and compiler
s-nail                 BSD Mail/POSIX mailx: send and receive Internet mail
sqlite                 Embbedable SQL engine.
st                     Simple Terminal.
tcc                    Tiny CC which compiles itself.
zlib                   Lossless data-compression library.

(*) This list is ordered by name.