Snaplr is a lightweight desktop screen capturing app, use it to grab region of your screen then quickly annotate it with a easy palette tool set. Snaplr if perfect if you need a quick and easy tool. Free to download for Windows and Mac.
Quick and simple to use
Effective,
Works all the time
Never get tired of it
Cons
Doesn't have a MINIMIZE button in top right corner so you can juggle apps easier. Otherwise, I don't have a complaint about it.
Summary
I've been using this app for years now. Previously on my WIN XP system, now on my WIN 8.1 laptop. I've tried many others including the Windows Snippet Tool, and they were all irritating or useless or they got in your way. Not so with this thing. It has one minor item that bugs me: if this app had a Minimize button, it would be perfect. It is true you can click on another app to change the cursor focus to the new app but a MINIMIZE button would be easier, more convenient. Otherwise, I will keep using it forever.