PhoenixMUD is reopened to all in 2017! One of the longest lasting MUDs around, it maintains many CircleMUD features and adds a bunch but has only a few traces of its original stock zones. Feel free to roleplay, explore, or just hack and slash. The immortals understand that games are meant to be fun. They understand that games should be newbie-friendly at low levels yet still challenging at high levels. And they understand the difference between "challenging" and "tedious".
With these principles in mind, they have made this PhoenixMUD better than ever.