Camtasia froze and crashed on me a lot. I found BB Flashback Recorder. Its never crashed on me. There's a free version I believe. It doesn't allow you to speed up video though and a few other things, which is why I got the Pro version.
I use Debut Video Capture Software. I think that works pretty good. There is a pro version but it's close to forty dollars. So yeah, if you're not looking to use any of the advanced features it has or not willing to spend the money, the free version works great.
It's not very well known but Microsoft provides you with a good screen recorder for free! XD, it's called Expression Encoder; the catch is that it's a bit hard to get, as they mostly promote the pro version of that software.