First up we've got a blog from our very own conference speaker Alexandru Nedelcu. His blog Tail Recursive Functions (in Scala) features a live coding video and a helpful article.
Another Recursion focused blog from Daniel Ciocirlan on the JVM blog; How to Sort Lists in Scala with Tail Recursionis only a five minute read, with four main sections and code examples.
For a slightly different read we have Image Editing with Functors, it runs through the code which you can use for different colours and is by Adrian Salajan.
And Virtus Lab, where Martin Odersky sits on the advisory board, released a Scala 3 cooperation update!