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PostgreSQL is 26 and is still something worth getting excited over and there are even older projects like Erlang, which is 36 years old, where there are still exciting things going on.

People just have to look around.

Java, with all ongoing research, although probably unpopular around here.

ML going mainstream via F#, Scala, Rust, even changes in Java and C# to accomodate for ML like features.

Haskell.

CSS is 26, so almost!

Erlang

Emacs

PHP :)