Cadence is a set of tools useful for audio production. It's being developed by falkTX, using Python3 and Qt4 (and some C++ where needed). The tools share the same base source code, so most of them look quite similar (which is intentional). Also, lots of custom widgets were coded when needed (like pixmapdial, pixmapkeyboard, patchcanvas and systray). They can be re-used in other projects. Contact the author if you need help on that.