[Trisquel-users] Re : free save formats -- list

[magicbanana]

The format used by a free application necessarily is free. Anybody can study  
how it is implemented given the access to the source code. As a consequence,  
your questions become "what are the formats used by the free applications  
for...".

That said, and as andrew points out, your question may be about "free  
standards" (with some kind of quality stamp). For instance the mm file format  
(based on XML) of FreeMind and derivatives (the most famous mind mappers) is  
free but I doubt it is a standard.