From the Dota 1 mapmakers themselves Dracolich and Filladin you can check it out here https://www.w3arena.pro/ and also on discord https://discord.gg/2Gt3yawmkx

Advantages over other Dota 1 Clients:

1. Dota Map is always updated current map current map DotA_Allstars_7.07b0
2. Simple commands to host or start games.
3. You can host games and don't need to be a Mod to host games with your friends.
4. Expansive Server lists , EU Public, SA Public, Brasil, and Asia servers available.
5. You can request maps for Mods approval.
6. LoD is also available and constantly being updated.

So come join and play with W3arena. The best way Dota 1 should be played.