Valkyrien Warfare was the original name of Valkyrien Skies. The CurseForge page for example used it. (it has since been renamed to valkyrien-skies)
Valkyrien Warfare Revamped was the successor to it.
Valkyrien Warfare Revamped
Valkyrien Skies 1
Valkyrien Skies is the current name of the mod. Valkyrien Skies 1 refers to the version released for 1.12 and currently not receiving any official support .
Valkyrien Skies 2
Valkyrien Skies 2 is the version currently in active development. It features a purpose-built physics engine, Krunch. It exists versions for 1.16 and 1.18, community members also have plans to backport it to 1.12. This wiki, the website, the GitHub repository, the CurseForge page and the Discord server currently all use this name.