I started programming in 1977, back then processor speeds and memory sizes were considerably less than what we have now. I learned how to achieve much with little, and from time to time I deliberately return to that time by using resource-limited tools.
Antonio is actively developing tbas, and we're currently up to Beta7 in-house. We've got it running under Linux, the Windows Subsystem for Linux (WSL), Cygwin (32bit) and Cygwin64. It should compile for MacOS. Source is available along with comprehensive documentation.
tbas has a number of quirky limitations which provide interesting opportunities to think outside the box. Strings, for example, are a maximum of 255 characters long! There are some intriguing ideas too, like CHANGE.