Not open source, but both HitFilm and DaVinci Resolve have very capable free versions. The former is easier to pick up coming from After Effects or similar programs, and has pretty modest system requirements, while Resolve is more powerful and can be used on Linux. Resolve is also a very good deal should you ever want to upgrade to the paid version, as it’s just a single one-time payment of around 300$, and you’ll get future updates too.
Not open source, but both HitFilm and DaVinci Resolve have very capable free versions. The former is easier to pick up coming from After Effects or similar programs, and has pretty modest system requirements, while Resolve is more powerful and can be used on Linux. Resolve is also a very good deal should you ever want to upgrade to the paid version, as it’s just a single one-time payment of around 300$, and you’ll get future updates too.