rpgxp is a project that seeks to be able to create games compatible with mkxp.
It's under development and many features are missing. Code is written to work, so sometimes it's a mess. Contributions and bug reports are welcome.
It's written in Ruby on GTK+3.

It is licensed under the GNU General Public License v3.

Ruby, rake and the following gems (including their dependencies):

• gtk3
• ruby-filemagic
• launchy
• os
• gettext
• open5
  They be can downloaded running $ rake deps

First download a mkxp executable (licensed under GPLv2) from here or an amd64 Ubuntu-compatible statically linked binary from here. Once extracted, get the binary and rename it "mkxp_linux" in the data/system/ directory.

Download the public domain soundfont: GMGSx.sf2 and place it in the data/system/ directory.

To install run the following commands:
$ rake
$ sudo rake install
You can change installation directory using the PREFIX environment variable, e.g.:
$ PREFIX=/usr sudo rake install

To run just execute: $ rpgxp

GNU instructions should work on Darwin. Win32 is not supported (yet?).