HLM is a proof assistant for everyday mathematics, which is currently being developed. It aims for a user experience as close as possible to regular mathematical practice, and proofs which are understandable by humans with little extra effort.
proof verifier for mathematicalproofs and documentation generator
In the tradition of Hilbert's program we create a formal correct (checkable by a proof verifier) but readable (like an ordinary LaTeX textbook) mathematical knowledge base which is freely accessible within the internet. Logic and set theory started.
Superficially, Dominoes on Acid is a solitaire variant of Dominoes with weird colorful tiles. But on a deeper level it is a GUI for natural deduction. Every completed domino is equivalent to a proof of a tautology in classical propositional logic.