Hive-Engine is where you can trade all the tribe and game tokens - DEC is probably the best known. There's many more. 

https://hive-engine.com/?p=balances&a=revisesociology

If you use Peakd as a front-end, the wallet page has an option to easily allow you see your HE tokens. 

One my favourite tribes is leo - https://leofinance.io/

If you post about finance related stuff on that platform it posts to leo and hive, and you have the potential to get rewarded in both HIVE and LEO. 

Besides being interested in finance stuff (I mean, who on here isn't!) I get a 30% curation return with LEO, which is about 2.5 times better than on Hive, which is why I'm stacking this particular token. 

You can also trade with their exchange - leodex.