I have released five of my internal tools on Github under the GNU
GPL, not only in the hope that they are useful to others, but
also to indirectly promote the D language, in which most of them
are implemented.
https://github.com/senselogic
These tools are :
* Basil, a textual database builder (D).
* Genesis, a generic source code preprocessor (D).
* Patchup, a scriptable source code patcher (D).
* Pendown, a lightweight markup for colored documents (JS).
* Pepss, a SCSS preprocessor (D).
All of them are implemented as single file scripts without
external dependencies, to be easily compilable.