Head Index is an easy to use, server-side head database mod for the Fabric Loader. Head Index provides easy access to over 36,000 heads provided by minecraft-heads.com. Unlike a plugin, Head Index can also be used in singleplayer without the need for a server. New heads are added all the time and will be automatically added whenever you restart the server without needing to update. Heads all have a UUID and texture value set to eliminate the lagspikes experienced with traditional custom playerheads. 
Easy to use GUI interface
7 Different Categories
Searching
Custom Player Heads
Commands
/head - Opens head GUI
/head menu - Also opens head GUI
/head search <search> - Opens search menu
Permissions - Compatible with LuckPerms, PlayerRoles or any other farbic permission manager
headindex.menu - Grants /head and /head menu - Defaults to level 2 OP
headindex.search - Grants /head search and button in GUI - Defaults to level 2 OP
headindex.playername - Grants custom heads in GUI - Defaults to level 2 OP