There are several free screen recording software options available, including:

• OBS Studio (Windows, Mac, and Linux)

OBS Studio (Open Broadcaster Software Studio) is a free and open-source screen recording and live streaming software. It can be used to capture video and audio from your computer's desktop, as well as from connected devices like webcams and capture cards. OBS Studio can be used to record video for presentations, tutorials, and other videos that require recording your computer screen. It also allows you to live-stream your screen and other sources to services like YouTube, Twitch, and Facebook Live.

OBS Studio offers many advanced features such as scene composition, encoding, and multiple audio tracks, it also allows you to add overlay to your recordings as well as add picture in picture webcam. It's available for Windows, Mac, and Linux platforms. There is also a large community around OBS Studio, with many resources and tutorials available to help you learn how to use it effectively.

• Bandicam (Windows)
• Apowersoft Free Online Screen Recorder (Web-based)
• ShareX (Windows)

ShareX is a free and open-source screen capture and file sharing software for Windows. It's designed to be lightweight and easy to use, while still offering a wide range of features. ShareX allows you to capture screenshots and video recordings of your entire screen, specific regions, or active windows. You can also record GIFs and WebM files, as well as capture screenshots and images from webpages. ShareX also have the ability to do many actions on your captures like

• Image editing and annotation
• Watermarking
• Color Picker
• Image Effects
• and many more.

One of ShareX's unique features is its ability to upload captured files to more than 80 different file sharing services, including popular options like Imgur, Dropbox, and Google Drive. ShareX also includes a built-in image editor that allows you to add shapes, text, and other annotations to your screenshots before uploading them. You can also use ShareX to automate tasks, like capturing a screenshot every 30 minutes or uploading files to a specific folder on your computer.

• QuickTime Player (Mac)
• DU Recorder (Android)
• AZ Screen Recorder (Android)
• iOS Screen Recorder (iOS)

Each of these options has its own set of features, so it's a good idea to research them further to find the one that best fits your needs.