Other smalltalks/lisps
In addition to Squeak, there's another popular, Free Software implementation of Smalltalk, Pharo (pharo.org), which has a lot more focus on higher-level development tools. On the LISP side, a lot of GNU components use the Scheme dialect GUILE to control a GNU OS at the lowest levels: the GNU Shepherd daemon manager, GNU GUIX package manager, and another interesting component is GNU MES (a small LISP interpreter and a small C compiler that can bootstrap each other, for bringing up a whole system from a free software core).