Filter Forge is a high-end graphic app which allows you to generate textures, create visual effects, enhance photos, and process images. It features 14 thousand ready-made realistic and abstract textures and effects, and a powerful visual editor to create custom ones.
The listed price is for the Basic version of Filter Forge. You can compare the different versions and their options on the developer site.
Note: Version 8 is a paid upgrade from version 7.