This plugin is an "addon" to BlueMaps for Minecraft servers and as such is required as standard.

It can be found here:
https://modrinth.com/plugin/bluemap
https://www.spigotmc.org/resources/bluemap.83557/

The plugin will work without, but, the whole point is to show factions from the factions plugin, this can be downloaded here;
https://jeremyfail.dev/projects/plugins/factions/

Note: Factions3 is the most up to date version of the original Factions plugin. ImprovedFactions, NewFactions and FactionsUUID are all branches of Factions1, Factions3 is a branch of the final closed-source Factions2 and their improvements.