ShareX

ShareX is a free and open-source desktop program for Windows that allows users to capture or record any area of their screen. It provides various capture methods, image editing tools, and options to upload captured content to a wide range of supported destinations.

ShareX is primarily a screenshot tool, but it does offer screen recording capabilities, which aligns with the 'screen-recording' must-have feature. It also allows for sharing files and URLs, which can be interpreted as 'instant-shared-links' for the recorded content. The 'Image editor' and 'Image effects' tools suggest some basic editing capabilities, which could extend to video, aligning with 'basic-video-editing'. However, it lacks explicit camera recording, viewer analytics, and video-specific collaboration features like timestamped comments or emoji reactions, which are core to Loom's asynchronous video communication focus. The primary use case of ShareX is not asynchronous video communication, but rather general screen capture and file sharing.