Availability of resources for obtaining information by the community. Development is not carried out behind 7 doors under 7 locks, and community regularly receives new information on development and 'fresh' screenshots/videos. The involvement of the community in the process.
There are not only concepts, but also examples of ongoing work, for example: armor models and textures, maps. Not all major modifications, worthy of attention, included in the list, if you want to see your favorite mod in this list - write in the comments. 'Commercial projects' were not (and will not be) added to the list - mods implemented by people, who is not not related to M&B games, to make profit from the game based on Bannerlord.