This is the github home to a collection of Bordlerlands 3 Mods. At the moment, all the mods stored here are made using the hotfix injection method of BL3 modding, which basically just adds custom hotfixes to the ones sent to the game by Gearbox.
The best method for running Borderlands 3 mods is using c0dycode's B3HM (Borderlands 3 Hotfix Merger). B3HM is a tool which merges in custom hotfixes for BL3 to pick up. It's available either as a standalone EXE, or as a DLL which you can inject in a variety of methods. You can find B3HM in these locations:
The B3HM project has documentation right at its github page.
For the DLL version, it's recommended that you use FromDarkHell's BL3DX11Injection/PluginLoader to inject the B3HM into the Borderlands 3 process. For the EXE version, just download the EXE and give it a run.
See the B3HM documentation for further information about how to use the app! There's also an easy-to-follow HOWTO about running PluginLoader + B3HM, and a tutorial video, both by by FromDarkHell.
Other information (such as some info for Linux users) can be found at borderlandsmodding.com.
Obviously you can just browse around this github repo to find mods that you like, but since the mods are arranged by author, it might be difficult to know exactly what's available. Like for BL2/TPS mods, we've created a Borderlands 3 ModCabinet Wiki which categorizes mods by what they do, and will probably be much easier to work with.
Some mod authors might decide to store their BL3 mods somewhere other than here, of course. If any major hubs of BL3 mod distribution ever becomes popular, we'll link it in here. The Borderlands 3 section of Nexus Mods is likely to start accumulating these kinds of mods, once friendlier tools are developed to make use of them.
See README-authors.md for information on both writing BL3 mods, and contributing to this github (and associated wiki).