Audacity supports to export to several audio formats - including the Ogg Vorbis (*.ogg), so it should be not a problem to perform AUP to OGG conversion with that program. It is unlikely any other program could work with AUP projects, as they are exclusively used in Audacity and as with many projects file types do not contain the actual multimedia data, just references to them and settings.
Convert Audacity project to Ogg Vorbis audio file.
We have found 2 software records in our database eligible for .aup to .ogg file format conversion.
Microsoft Windows software - convert aup to ogg on Windows
A free, open source software for recording and editing sounds
Convert from aup file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned aup to ogg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Linux/Unix software - convert aup to ogg on Linux
Multi-track audio editor for Linux