Nik collection is most likely the best filters and enhancement tools you can get to Photoshop. It’s now acquired by google, and offered as a free download. Been using them for almost 10 years.
Silver efex pro, best tool for black and whites.
Color efex pro, personal favorite is the film effects, these are very accurate for some of the old analog famous films. They give you that organic type of look, that can be hard with default digital.