Recording and Editing
Read this page and search the subreddit before asking any questions about game recording software, especially what programs to use. It's a common subject and there's a wealth of information out there so 99% of the time you aren't asking anything new.
- mirillis Action!
- MSI Afterburner (good for AMD cards) - can record constantly and be toggled to save the last X amount of time
- Plays.tv recorder
- Shadowplay (Nvidia cards) - can record constantly and be toggled to save the last X amount of time
- Audacity (audio)