Available again:
ZD Soft Screen Recorder is a high-performance and easy-to-use screen recording software program for Windows. It captures screen activities and sound, and saves as video files. You can use it to create tutorial videos, make demo videos, convert presentations to videos, capture streaming videos, record PC gameplays and so on. It’s a lightweight, fast and reliable software tool you would love in seconds.
OBS is always free and open source. Try it out.
https://obsproject.com/
It also officially supports Twitch.tv, if you are into the game streaming craze.