In May 2005, the source code was released as free software under the GNU GPL-2.0-or-later, and it was soon ported from QuickBASIC to FreeBASIC and to modern operating systems.

HamsterSpeak, the custom scripting language used by the OHR, is very simple and is intended for users with no prior programming knowledge.

HUDs, battle systems, special effects, customized menus, and entirely scripted non-RPG games can be created with it.

The engine was created alongside its first game, Wandering Hamster, demos of which were released in late 1997, and which is still in active development as of 2020.

[1] The OHRRPGCE gained the ability to play sound files as well as other music formats with the release of "Ubersetzung" on September 21, 2007.

[9] A number of OHRRPGCE games have been released on the Google Play,[11] Steam, Itch.io,[12] and other stores, as well as on the discontinued Ouya and Gamestick console systems[citation needed].