Accessibility software

Screen readers

Balabolka is a Text-To-Speech (TTS) program. All computer voices installed on your system are available to Balabolka. The on-screen text can be saved as a WAV, MP3, MP4, OGG or WMA file. The program can read the clipboard content, view the text from AZW, AZW3, CHM, DjVu, DOC, EPUB, FB2, HTML, LIT, MOBI, ODT, PRC, PDF and RTF files, customize font and background colour, control reading from the system tray or by the global hotkeys.
Download Balabolka for Windows

NaturalReader is Text to Speech software with natural sounding voices. This easy to use software can convert any written text such as MS Word, webpages, PDF files and emails into spoken words. NaturalReader can also convert any written text into audio files such as MP3 or WAV for your CD player, iPod, or MP3 player.
Download NaturalReader for Mac and Windows

NonVisual Desktop Access (NVDA) is a screen reader for Microsoft Windows providing feedback via synthetic speech and Braille.
Download NVDA for Windows

ChromeVox is a screen reader for Chrome browser which brings the speed, versatility, and security of Chrome to visually impaired users.
Download ChromeVox

Visual aids

Accessible PDF Reader is a free program that opens PDF files as plain text, making them easy to read with a screenreader. Files can also be saved as text documents so you can easily read them later.
Download Accessible PDF Reader

Black Window is used to enhance visibility and reduce distractability of other programs. It fills the screen with a black background which remains underneath other programs. Minimise or close the program to restore normal Windows appearance.
Download Black Window for Windows

Click-N-Type is an on-screen virtual keyboard designed for anyone with a disability that prevents him or her from typing on a physical computer keyboard. As long as the physically challenged person can control a mouse, trackball, touch screen or other pointing device, the software keyboard allows you to send keystrokes to virtually any Windows application.
Download Click-N-Type for Windows

Virtual Magnifying Glass is a free, open source, cross-platform screen magnification tool. It is simple, customisable and easy-to-use.
Download Virtual Magnifying Glass for Windows

Fangs Screen Reader Emulator renders a text version of a web page similar to how a screen reader would read it. The ambition is to help developers understand how an assistive device would present a website and thereby increase chances of finding accessibility issues early.
Download Firefox Fangs Emulator

Mac users - inbuilt software

System Preferences:

Enable text to speech options in the 'Speech' or 'Dictation & Speech' panel.

Enable VoiceOver spoken and Braille options in the 'Accessibility' panel.

Enable the 'On-screen keyboard' via the 'Accessibility' panel.

Enable 'Screen magnification ("zoom")' in the 'Accessibility' panel.