I am looking for:

1. a way to search inside odt files (i.e. search for contents, not name)
2. that does not require any kind of indexing
3. that is graphical and very user-friendly (for a relatively old person, who does not like computers much)

I know that it is possible to have 1) and 2):

for x in `find . -iname '*odt'`; do odt2txt $x | grep Query; done

works well enough, and it's pretty fast. But I wonder if there is already a good solution that does this with a GUI (or can be adapted to do this easily)