Welcome to MR, tmb2.
MR has free ebooks that have been beautifully handcrafted by some very dedicated MR members.
ePub format and
Sony BBeB / lrf format
You can check out the free ebooks on
feedbooks.com and
manybooks.net
Plus,
smashwords.com and
baen.com for free and for purchase ebooks. (Baen has a
free library)
It sounds like you have heard of
Calibre to manage your library of DRM free books and Kovid, the creator, frequents the forums here. We even have a dedicated
Calibre forum.
Have fun in the forums and ask if you have any questions.
PS Check my signature and click on the links to find more information.