Zoo for Zotero is a free opensource program for viewing your Zotero Libraries!
It's reasonably fast and modern and supports collections, group libraries, webDAV, searching, annotation syncing for attachments, as well as other features.
Currently we only support using the official Zotero Account Syncing.
The app caches the library and only syncs changes so it should be friendly to large libraries! (after the initial sync of course)
I made this app as a hobby/passion project, and I would love it if you leave a review below!
Also if you want to contribute you can find the project page at https://github.com/mickstar/Zoo-For-Zotero
I'm 100% open to receiving feedback/problems related to the app, please use the github issues forum or alternatively email me.