Dictionaries

MobileSign is a free British Sign Language lexicon app. MobileSign includes a library of over 4000 signs accessed using a predictive search engine, MobileSign will also automatically keep a list of your recently viewed signs for repeat access later.

http://www.mobilesign.org/

Free online BSL dictionary. The dictionary holds over 21,000 English words and 80,000 BSL signs!

http://www.actualsigns.com/BSL_Dictionary-i-123.html

Many Sign Languages:

http://www.spreadthesign.com/

British Sign Language Dictionary

Search and compare thousands of words and phrases in British Sign Language (BSL). The largest collection of free video signs online.

http://www.signbsl.com

http://www.britishsignlanguage.com/

ICT signs

http://slcresources4ict.net/index.php

Art-signs

http://www.artsigns.ac.uk/

Science signs

http://www.sciencesigns.ac.uk/

Engineering signs

http://www.engineeringsigns.ac.uk/