Natron is an open source software for video effects (video compositing), like After Effects. It is powerful but not intuitive. It Imports and exports dozens of video formats.
Powerful multi-platform 3D / 2D development software for video games, augmented reality, facial tracking, animations, interactive installations ... Recommended for experts.
Free with limitations
Video editing software with rotation, cropping, basic trim, conversion and adding watermark functions. Export also in full HD.
Free with watermark
Powerful 3D effects tool for videos and animations, the free version for students and hobbyists allows you to learn how to manage the powerful means at disposal.
This tool doesn't do much but it does it well and quickly. Crop and rotate videos. Very practical.