Foo 2.0 alpha release
Foo 2.0 RC1
Foo 2.0 RC2
etc, and if you just have "Foo 2.0" as a release it can be somewhat ambiguous as to whether someone named something wrong when downloading or describing it and left of that portion of the name, or if it's actually the full release, so they want a word to distinguish it as the actual full and final release of that version and not "the 2.0 branch"
"Final" may not be the best word choice for that, but it does at least accomplish the task of distinguishing the actual final product of that version from any other types of releases or the branch that will eventually become that.
