I want to go ahead and add two, since it's the same company but is technically separate between their free and premium hosting services.
I searched and haven't seen them mentioned yet, so:
Host Name: x10hosting
Notable Features: Free CentOS Linux hosting on LightSpeed web servers.
Pros: It's free, bandwidth and storage space are unlimited
Problems: Occasionally downtime because of unlimited storage (depending on which server you're on), usually fixed pretty quickly.
Overall: It's nice to start out with, test some things, etc... but eventually you'd want to upgrade to premium for a real community/site.
Host Name: x10premium
Notable Features: Cheap CentOS Linux hosting on LightSpeed servers
Pros: It's pretty cheap - $6.95 for a months worth of unlimited everything including bandwidth/storage, MySQL/PostgreSQL database 'slots', support tickets included. OR $3.95 per month for three years of hosting and a few other plans that they have- I thought the monthly hosting was most notable though.
Problems: I haven't run in to any problems using it so far for the ~5 months that I've used it.
Overall: I liked it a lot and I would recommend it for sure.