Underrated app suggestions?

[morrow8454]

Hey all,
What are some of your favorite little known apps? They can be in any category (accessories, games, tools, etc), I'm just trying to explore and experiment a little bit while I have some extra time.

 

[sergeantandroid]

I came across a pretty interesting walkthrough to customize your phone for an optimal music experience if you're interested.

 

[ag95keri]

I'm interested, Sergeant ... what app?