RelicTracker
Tracks relic materials across your inventory and retainers.
Tracks relic weapons, tools and armour across jobs, including material counts in inventories and retainers. The publisher also lists optional FFXIV Collect sync.
Kage
Add this URL to Dalamud’s custom plugin repositories, then find RelicTracker in the plugin installer.
https://puni.sh/api/repository/kage