OBS Studio (also known as Open Broadcaster Software, or OBS) is a screen-casting and live-streaming software available across multiple platforms including macOS, Windows and Linux. Boasting features typically only found in commercial screen recording apps, OBS also provides one of the simplest workflows with an intuitive and easy-to-learn interface that makes recording and streaming a breeze. It's also totally free and open-source.
- Good quality. easy to use, free is the best kinda of price. Consider kicking some bucks to the developer!
- The software is for only recording and streaming. You can't edit a video though OBS
- Camtasia is for recording your screen, then bringing in that footage into an internal NLE for further editing, annotation, etc before eventually rendering out a final video. OBS on the other hand can record your screen but has no editing facility whatsoever. As such, it's not an alternative to Camtasia unless you only want to capture your screen.