[SQLite]

Tcl/Tk is very much alive, and actively maintained. See the check-in history at https://core.tcl.tk/tcl/timeline (Tcl) and https://core.tcl.tk/tk/timeline (Tk). There are annual conferences for developers and users - one in Munich this year (http://www.eurotcl.eu/) and another in Houston (https://www.tcl.tk/community/tcl2018/index.html).