The source of all software here (except the emulators/, System-80 ROMS/ and cpm/ dirs) is allegedly the TOSEC Project (http://www.tosecdev.org/), or at least the downloaded bundle of software billed itself as a TOSEC Project DVD. However, TOSEC itself is only a cataloguing project; it catalogues old software but doesn't make it available. TOSEC used to have a "sister site", TOSECiso.org (now defunct), which is perhaps the actual source.