DC Special Plugin Filters
DCspecial plugin filters work with various Graphics Apps. Highly Prized collection 6 years in the making. includes various Tile Tools, Layer FX, and even some Psychidelics
http://www.bmath.net/dc/

AmphiSoft
Plug-in filters for Adobe Photoshop, Macromedia Fireworks, JASC, Corel and other compatible image editors
http://photoshop.msk.ru/

Tyder Ltd
Provides digital filter design software which can produce specialised filters e.g. Windowed FFT, Optimal FIR filters, and IIR filters.
http://www.tyder.com/

AlphaPlugins
Software Plug-ins, plug-ins, filters and special effects for Adobe Photoshop, Adobe After Effects, Adobe Premiere and etc. Here You can find many interesting, original additional modules with special effects for populare graphic and video editors.
http://www.alphaplugins.com/

Simple Filters
Easy to use filters for enhancing Photoshop and Paintshop Pro - Not available anywhere else!!!
http://www.btinternet.com/~cateran/simple/

Simple Filters
Easy to use filters for enhancing Photoshop and Paintshop Pro - Not available anywhere else!!!
http://www.btinternet.com/~cateran/simple/

OPT Hellas Custom Frequency Control Components
Manufacturers crystals, crystal filters, lc filters rf and microwave filters. Descriptions and catalogs and international sales network.
http://www.opthellas.com

Reclaim filters and system, Inc.
Reclaim Filters brings you reliable and economical solution to your basic filtration needs. Clean and recover your water with our filters and filter systems. Based in Wake Forest North Carolina
http://www.waterreclaim.com/

Kemo Signal Filters
Electronic filters, a full range of systems and modules
http://www.kemo.com/

Lee Filters
High quality camera filters, lighting filters, gobos, and other studio-related products. Camera Bellows.
http://www.leefilters.com/