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For Windows: MUSHClient: http://www.gammon.com.au/mushclient/mushclient.htm Works a treat even on Windows 10.
On Android, I used LensDroid, a client specifically written for Lensmoor, but works with what I play: https://play.google.com/store/apps/details?id=net.lensmoor.lensmoorclient
What I play: DiscworldMUD: It's themed on Terry Pratchett's Discworld novels. http://discworld.imaginary.com:5678/ It's LPMud based, has colors, a great "newbie" area, and great newbie helpers (I'm one of them). There's no emphasis on RP, but you can if you want. There's no emphasis on PK, but you can at your own peril. There's no emphasis on anything, really, and people tend to find their niches. There are guilds. After 20 minutes, you can save your character, and your stuff saves with you. (I have seen MU* that don't save your gear.)