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A laptop/notebook cooler, cooler pad or chill mat is an accessory for laptop computers that helps reduce their operating temperature, which is normally used when the laptop is unable to sufficiently cool itself. Laptop coolers are intended to protect both the laptop from overheating and the user from suffering heat related discomfort. A cooling pad may house active or passive cooling methods and rests beneath the laptop. Active coolers move air or liquid to direct heat away from the laptop quickly, while passive methods may rely on thermally conductive materials or increasing passive airflow.

XO-3 was a tablet/e-book reader intended to be developed under the One Laptop per Child initiative. It was planned to have a tablet computer form factor over the canceled dual-screen design concept of the XO-2. The inner workings were those of the XO 1.75 together with the same ARM processor.

The XO-3 featured an 8-inch 4:3 1024 x 768-resolution display and used a Marvell Technology Group Marvell Armada PXA618 SoC. The XO-3 was intended to feature innovative charging options such as a hand crank or a solar panel.

The XO-3 tablet was planned to be released in 2012 for a target price below $100. The XO-3 and accompanying solar cell & handcrank power options were demoed at the International Consumer Electronics Show (CES) in January, 2012 as shown on BBC News technology programme Click.

The project was cancelled in November 2012, but a new hardware product is under development with the name XO-4 touch.