KOReader has a progress sync, with no restrictions, as to where or how you get your ebook files. It is a function that you access directly from within the KOReader menu structure, no browser needed. KOReader also has a good deal of calibre support, to include a limited "Calibre Companion" like function. It also supports accessing calibre's content server using OPDS. The search functions include a calibre metadata search function, so you can search for a listing of files/ebooks that match "tags".
(It is probably corrected already, but there was a problem with the server they were/are using, for the progress sync and they may have moved to another.)
Luck;
Ken
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