Thanks for the pointers.  Here's a few more projects that try to solve real problems that Bitcoin doesn't try to solve:

Handshake - censorship resistant DNS
Arweave - permanent web storage (aims for at least 200 years)
Chia - novel, low cost consensus mechanism 
Filecoin - low cost, decentralized storage 
Zcash - privacy 
Chainlink - Oracle services 
Nym - incentivized mixnet
Kleros - decentralized dispute resolution 
Tari - private NFT's