Kaspa is a proof-of-work cryptocurrency which implements the GHOSTDAG protocol. Unlike traditional blockchains, GHOSTDAG does not orphan blocks created in parallel, but rather allows them to coexist and orders them in consensus. Whereby our blockchain is actually a blockDAG; you can see GHOSTDAG in action in a real time blockDAG visualizer. This generalization of Nakamoto consensus allows for secure operation while maintaining very high block rates (currently one block per second, aiming for 32/sec, with visions of 100/sec) and minuscule confirmation times dominated by internet latency. The Kaspa implementation includes a lot of cool features and subprotocols including Reachability to query the DAG's topology, Block data pruning (with near-future plans for block header pruning), SPV proofs, and later subnetwork support which will make future implementation of layer 2 solutions much easier.
Kaspas is founded by Yonatan Sompolinsky. Postdoc CS at Harvard University on the MEV Research Team. Yonatan's 2013 paper on Ghost protocol is cited in the Ethereum Whitepaper. The theoretical basis for Kaspa was envisioned by R&D company DAGLabs, through investment by PolyChain. Nonetheless, Kaspa was launched as a 100% decentralized community project, completely open source, no central governance, and VCs.