Atmel Corporation

They make pretty good 8-​bit embedded micro-​controllers, notably found in the Arduino.
They also make a line of ARM-​based (32-​bit RISC) micro-​controllers.
Unfortunately (?), the AVR series has been such a success that the ARM group often feel neglected. I suspect that the Atmel ARM group would be much better off if they were spun off into a separate company. At least, their users would be better off.. .

These guys make great low-​end microcontrollers. This review will be mostly about this as I have little experience with their FPGA products and their analog line.
What’s to love– the peripherals are nice and predictable and intuitive; there’s good computing power per watt in their 8-​bit line. In-​system programming actually works well, and their embrace of the GNU compiler chain gives a good open development approach. There’s a lot of kitchen-​sink parts that contain just about everything you could ever want. The new XMEGA parts continue to push things forward and the new event system is ripe for all kinds of uses, even those unintended by the original designers.
Unfortunately, the higher-​end 8-​bit parts are expensive (this is an industry-​wide condition, though). Harvard architecture (especially combined with the GNU tools) can be a pain in 8-​bit land too. I like Philips/NXP’s ARM line a little more.