Tonel is a text-based file format used to store Smalltalk source code on disk, and was designed from scratch to be version control system (VCS) friendly. It is widely accepted by the Smalltalk community at this point, so Instantiations saw an opportunity to enhance ENVY (the standard VCS in VAST) by adding Tonel support for greater functionality and flexibility.

Open source projects using Tonel for VAST can be found in the VAST Community Hub or in Instantiations' GitHub respositories.