I've got to be completely honest, Photoshop Actions are quite new to me. I am also quite a purist with photography, so I will often prefer to not edit an image so heavily. However, there are some wonderful Photoshop actions, and I am going to share some I like with you as I discover them!
Noise-Less's Variety Pack .3 0.3-3 plus extra editing.
Noise-Less's Variety Pack .3 0.3-5 plus curves.
Miss-Etikate's Photoshop Action 15 plus extra editing.
I found these actions in this article, 100 Free Photoshop Actions, well worth a look! And if you're unsure how to install a Photoshop Action and make it work, I found this tutorial helpful :)