RVM is maintained by community of volunteers, report issues to RVM issues tracker.
If you can help or wish to become one of the maintainers - just start helping. You can find more RVM related projects at RVM Github organization.
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Other terminals: LXTerminal, XTerm, Konsole, Zsh + iTerm and anything else.

Integrating RVM with gnome-terminal

If you are going to use RVM installations with gnome-terminal, you'll probably need to change its default options. Note that Ubuntu's and Linux Mint Terminal application is actually gnome-terminal.

Multi-User RVM creates a script in /etc/profile.d, which is being sourced on startup. Also, most people put the RVM sourcing line required to load RVM in their ~/.bash_profile for Single-User installs. By default, gnome-terminal runs Bash as usual, as a non-login shell, therefore skipping /etc/profile* and executing only the user's ~/.bashrc. This means that RVM doesn't load and you get the infamous 'RVM is not a function' message.

For RVM to work properly, you have to check the 'Run command as login shell' checkbox on the Title and Command tab of gnome-terminal's Edit ▸ Profile Preferences menu dialog, in case the menu is missing right click the terminal app and navigate Profiles ▸ Profile Preferences.

Here is a screen shoot of the dialog with highlighted checkbox:

Gnome Screenshot

For more information on what this means, please read the explanation regarding Shell logins especially if you are in doubt, or advised by other sites to not use it.