Hello there! This is the place for all of the little boards that I work on that don't really fit anywhere else. It's also to help open source designs others can reference and I can provide links to.
git clone --recursive https://github.com/dragonlock2/kicadboards.git
Schematic PDFs are automatically generated and deployed at matthewtran.dev/kicadboards. I recommend KiCanvas for online layout viewing.
KiCad's calculator doesn't currently include one for a coupled coplanar waveguide with ground ("differential-coplanar" in Altium). Thankfully an open-source solution exists, atlc. It can solve arbitrary trace shapes, but as a result is quite slow. Minimal source code for v4.6.1 has been added here, with the build system switched to CMake.
cd scripts/external/atlc
mkdir build && cd build
cmake ..
cmake --build .