The LM393 is a dual-comparator chip that is the heart of the popular "Sandwich bot" project in the book "Robot Building for Beginners"
Low voltage dropout regulator.
A 28 pin 8 bit microcontroller in a DIP package as used on the Sumovore Atmel Brainboard add-on.
These water-clear standard sized (T1-3/4) LEDs are considerably brighter than most other LEDs in their class. Available in red, green, yellow, blue and white.