Free of charge software

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Free software, freedom-respecting software, software libre, or libre software is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute the software and any adapted versions. The right to study and modify software entails access to its source code. For computer programs that are covered by copyright law, this is achieved with a software license by which the author grants users the aforementioned freedom. Software that is not covered by copyright law, such as software in the public domain, is free if the source code is in the public domain, or otherwise available without restrictions. Other legal and technical aspects, such as software patents and digital rights management may restrict users in exercising their rights, and thus prevent software from being free. Free software may be developed collaboratively by volunteer computer programmers or by corporations; as part of a commercial, for-profit activity or not.

Source: Wikipedia

List of free products
The table shows the products that are distributed for free The table shows the information distributed in seven columns: 1st name of the product; 2nd version of the software; 3rd type of product according to the TecnoAccessible classification; 4th classification of the product according to ISO 9999; 5th the operating system for which it is compatible; 6th company, person or entity that has developed the product; and 7th illustrative image of the program interface
Name Version Type ISO OS Maker
AbleNet Symbol Library Picture language 05 06 21 Assistive products for training in icons and symbols, 22 21 12 Face-to-face communication software AbleNet AbleNet symbol library image
Aipoly Vision 2.0.2 Artificial vision 22 27 06 Indicators with acoustic signals iOS 10.0 Aipoly Inc. Aipoly Vision app image
Alexicom AAC (Android) 1.1.1 Symbolic communicator 22 21 12 Face-to-face communication software Android 1.5 (Cupcake) Alexicom Tech Alexicom AAC communicator interface image
Alexicom AAC (iOS) 1.3.0 Symbolic communicator 22 21 12 Face-to-face communication software iOS 4 Alexicom Tech Alexicom AAC communicator interface image
Be My Eyes 1.5.5 Collaboration 22 24 24 Telecommunication and telematics software iOS 9.2 Be My Eyes project Be My Eyes interface image
Big Mouse Pointer v1.4f Mouse cursor 22 36 18 Input software Windows XP, Windows Vista, Windows 7 Moose O'Malley's Software Valley Configuration window image
Click-N-Type 3.03.0397 Virtual keyboard 22 36 18 Input software Windows 98, Windows Me, Windows 2000, Windows XP, Windows Vista, Windows 7 Lake Software Click-N-Type keyboard image
Dragon Dictation 2.0.8 Speech recognition 22 36 18 Input software iOS 4 Nuance Dragon Dictation interface image
DSpeech v1.58.1 Text-to-speech 22 39 12 Special output software Windows XP, Windows Vista, Windows 7, Windows 8 Dimio DSpeech interface image
Enable Viacam 1.7.0 Head-operated mouse 22 36 18 Input software Linux, Ubuntu, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8 CREA Sistemas Informáticos eViacam face mouse image