The new ioquake3 "launch" project is starting to take shapoe and it's a launcher for ioquake3 -- currently with Quake III assets but other ioquake3-based games are likely to be supported later. The ioquake3 launcher is written in C++ and uses the Qt tool-kit for its user-interface.
So far this launcher can launch the ioquake3 program and set Quake 3 to run at different resolutions. Before an alpha release is made, the hope is to also have support for downloading and installing of Quake 3 patches and displaying the end-user license agreement (EULA) before patching.
Beta goals for the project include being able to download and install ioquake3, copy Quake 3 data from the retail CD, update ioquake3, update the launcher itself, and support for other operating systems.
Finally when this ioquake3 launcher is declared "gold" ready to ship, it should be able to handle launch configuration options, player configuration options, what-you-see-is-what-you-get name configurations, support for the Steam-based installation of Quake 3, backup/swap/save configuration support, and will be supported across OS X, Windows, and Linux operating systems.
Further plans for this launcher include support for other ioquake3 games like Tremulous and the odd TurtleArena, an automated mod switcher, a built-in server browser, integrated news feed, LAN support, URI integration, and preload mods/maps/content over the Internet.
More details and the code to this ioquake3 launcher that's under active development can be found via its new GitHub repository.