I found a fantastic tool for product demos that I must share.

Open Screen, an open-source screen recording tool, can produce professional-looking demo videos with zoom, annotations, and background effects.
It competes with Screen Studio, but it's completely free—no subscriptions, no watermarks, and suitable for commercial use.
Although it doesn't have as many flashy features as Screen Studio, it's more than enough for basic needs like product demos and tutorial recordings.
The interface is simple, and it's easy to get started.
For routine feature demonstrations or operation tutorials, the results from this are much better than the built-in screen recording tools.
Open source and free, with no tricks involved—if you need to record screens for demos, give it a try. 👇