An IRC client that uses Tcl for not only the scripting, but also the "glue" at the C level for how all the parts of the application fit together.
TIFFtools is a set of C++ bindings for libtiff along with some utilities that expand on the programs packaged with libtiff. One utility is tiffmesh which can be used to knit together to TIFF files one with odd and the other with even pages.
Trek7 the original multiplayer network star trek game from the early-mid 70s. We are hoping to revive this classic (no, its not netrek/mtrek, not even close). hopefully the SF community can help port this to modern day networks.