gitk and “git gui” are written in Tcl/Tk. Some components of the GNU toolchain use dejagnu in their testsuite, which is based on expect and written in Tcl. Th

gitk and “git gui” are written in Tcl/Tk. Some components of the GNU toolchain use dejagnu in their testsuite, which is based on expect and written in Tcl. The SQLite testsuite uses Tcl, too.