Less fully featured, but more open (Gaggiuino became closed source post people profiting off the OSS).
I'll also pitch another fun OSS project I sponsored a few years back to build an OSS pressure sensor and 0.1g scale: https://github.com/rhit-coultabm/Consistent-Cups-Espresso-Ac...
Since then it looks like Decent has OSS'ed the DecentScale: https://github.com/decentespresso/openscale