There are thousands of validators on Solana, so listing every single one here would be a bit much, but here are some examples of active validators: Sec3, Luna Labs, BlockRockers, nordstar, asaf91, HanoiHilton, GateOmega, OrbitFlare, SPACE HIGH, Watchtower, stakely, Yonta Labs, Staker Space, Zeta Node, Pumpkin's Pool,
polkachu.com, Sila Systems, Easy 2 Stake, The Lode, MCF, Ubik Capital, SolarTeam, T-STAKE Systems, Haus, and BLOCKSIZE.
If you want the full, up-to-date list (which is huge!), you can check out sites like
validators.app or Solana Compass for real-time stats and rankings.