The admin tool (https://tools.wmflabs.org) is the front page for Tool Labs. The codebase that powers this PHP site is a one-off "framework" that has been around for quite a while (3+ years?). Some work was done in early 2016 to update the codebase and make it slightly easier to work with, but there is a lot more that could and should be done to make this a codebase that people are not afraid to work with.
I'd like to update it to use the rWSLI wikimedia/slimapp framework as a base. This will allow introducing more structure to the code as well as open up the possibility of internationalization and other improvements.