Spiral Graphics Inc.

The Wood Workshop is a free seamless texture editor that specializes in the creation of seamless wood textures. It comes with a collection of over 100 preset wood textures, all perfectly seamless and ready to go at resolutions up to 3000 x 3000!

Genetica Viewer is a free seamless texture rendering application. It comes with hundreds of royalty-free textures of various types, all perfectly seamless and ready to go at resolutions up to 3,000 x 3,000!

Genetica 2 is a seamless texture editor with over 500 texture presets and automatic seamlessness. Among hundreds of new features are a new Substance Lab, a new Weather Lab, a new Cut & Tile Lab, and much, much more. Also comes in Pro edition.