Now that Survex has reached version 1.0, we are continuing progress towards version 2, in a series of steps, evolving out of Survex 1.0. The GUI framework is being based on aven, with the printer drivers and other utility programs being pulled in and integrated into the menus.
Aven is built on wxWindows, which means that can easily support Unix, Microsoft Windows, and MacOS X. MacOS 9 support is possible, but requires somebody with MacOS 9 and a compiler to build it with. Support for DOS is possible if there's sufficient interest. Support for RISC OS is unlikely unless someone very enthusiastic steps forward to do the porting work.
More information on our plans is on the web site.