If you just want to use wxTED, click on Releases to get the latest Windows binary.
wxTED is a teletext editor. wxted supports 26 languages including Arabic, Hebrew, Greek, Turkish and several Cyrillic. It supports all transmission flags for subtitles, newsflash etc. It also supports carousels (a page with rotating subpages).
It is currently compiled for Windows using Code::Blocks but it should be possible to compile it for OSX and Linux. The Windows version can run under Wine on Linux.
Developers: See manual.odt for an outline of how to set up a development environment.