https://github.com/talamortis/reward-system - valid tags and exists in the catolgue
(our fork, from the above) https://github.com/azerothcore/mod-reward-played-time - valid tags and doesn't exist in the catologue
(fork of our fork, from the above) https://github.com/freekode/mod-reward-played-time-improved - valid tags and doesnt exist in the catologue
Edit: Forks when forked, they do not come with the tags, so this should avoid as many duplicates as expected at first glance.