"Adafruit was founded in 2005 by MIT engineer, Limor "Ladyada" Fried. Her goal was to create the best place online for learning electronics and making the best designed products for makers of all ages and skill levels. ... Adafruit has expanded offerings to include tools, equipment and electronics ... Limor was the first female engineer on the cover of WIRED magazine and was recently awarded Entrepreneur magazine's Entrepreneur of the year."I will not attempt to review their gadgets but here are a couple of interesting and relevant educational downloads:
Guide to multimeters
Electronics guides
Digging around in their website is recommended.
Why "Ada"? - probable connection here to Ada Lovelace often described as the world's first computer programmer.