An open-source, fully programmable two-ball, three-button USB trackball by jfedor2.
Published November 22, 2021
Not a keyboard, but another nice companion.
The GitHub repository linked below contains design files and code that can be used to make a fully programmable two-ball, three-button USB trackball:
Published on Mon 22nd Nov 2021. Featured in KBD #53 (source).
with trackball, spotted by daurnimator
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