How can I browse Cydia repos without an iOS device?
Cydia is really a GUI front end for apt, the homebrew equivalent on iOS and many other Linux systems, so a Cydia repo is really an apt repo.

You can use CyDownload to view and download the packages(.debs) on your computer. 

Some popular repos:


BigBoss(http://apt.thebigboss.org/repofiles/cydia/)
Packix(https://repo.packix.com/)
Chariz(https://cydia.hbang.ws)
Coolstar/Electra(https://electrarepo64.coolstar.org/) (for iOS >= 11)
Saurik/Cydia(http://apt.saurik.com/) (for iOS &lt;= 10)