Ranked by market cap:

LTC is litecoin, Bitcoin competitor, but can be mined by GPUs. Maybe more here, but legitimate & has staying power. #18 by market cap.

Stellar is a Ripple (XRP) competitor IIRC, similar features; been around since 2014, #26 by market cap.

IOTA is a project I was very into when it first launched, was very promising but has been slow to deliver, I haven't kept up but they were aiming to have parity with Ethereum features without transaction fees (POW is the payment, you confirm 2 other transactions to post your own). It's #48 by market cap.

BAT is the token used by the Brave browser for advertising (maybe more uses now, but that's it's claim to fame), it's #71 by market cap.