Blackmagic Design Fusion (now part of Davinci resolve). For really simple things you can also use Hitfilm Pro There is also https://natrongithub.github.io/ ht

Blackmagic Design Fusion (now part of Davinci resolve). For really simple things you can also use Hitfilm Pro There is also https://natrongithub.github.io/ https://natrongithub.github.io/ but I haven't personally tried it