FreeSCI is an attempt to re-implement the Sierra Creative Interpreter (SCI), which was used in many of Sierra On-Line's games from 1988 to 1995.
SML/NJ Readline is a libreadline interface for SML of New Jersey, using the nlffi. It includes a typesafe mechanism for integrating functions and submenus into readline's auto- completion mechanism.
An extensible platform for data management.
unionfs implemented in userland (with help of FUSE).