These are for Photoshop CS3 and up. ABR file.
They include some basic brushes I made in Photoshop in the following styles: Pencil, pen, marker, oil pastel, gouache and splatter.
Bigger set also available here: https://gumroad.com/l/MGfgW
Also work in the latest version of Clip Studio Paint
These will work if you import the ABR file into the sub tool palette, you may have to change some settings for stroke spacing and watercolour edge on some of the brushes. Read about how to do that here: http://theartsquirrel.com/wiki/import-photoshop-brushes-into-clip-studio-paint/
If you want the presets ready made and customized to work exactly as intended for Clip Studio Paint, they are here: https://gumroad.com/l/PNKCy.