Software with word prediction is produced by multiple manufacturers. The software can be bought as an add-on to common programs such as Microsoft Word (for example, WordQ+SpeakQ, Typing Assistant, Co:Writer, Wivik, Ghotit Dyslexia), or as one of many features on an AAC device (PRC's Pathfinder, Dynavox Systems, Saltillo's ChatPC products). Some well known programs: Intellicomplete, which is available in both a freeware and a payware version, but works only with programs which are made to work with it. Letmetype and Typingaid are both freeware programs which work in any text editor.