An active Presenter is a free tool for screen recording and screencasting tool for Windows and OS X.
This can be used to enabling you to produce software demonstrations, software simulations, quizzes, and presentations.
Come with various export options: JPEG and PNG images, HTML slideshows, PDFs, Microsoft Word, Excel or PowerPoint presentations, interactive simulations, and a choice of video export options (AVI, MP4, WMV, and WebM).
I used to record my screen for free-tutorials official, see my youtube channel.
Even though video or image output will be further processed to meet host and search engine optimization rules, this is the main tool I use to make windows operating system tutorials.
This tool can be found on the developer’s official website.