Damn Small Linux

Damn Small Linux is a small Linux distribution that comes in a 50 MB LiveCD. It bundles lightweight applications such as Dillo (web browser), XMMS (multimedia application), FTP client, etc. It can run on at least 486SX CPU and 16 megabytes of RAM (128 MB recommended). The latest release (4.4.10) was released on 18 November 2008, while the latest Release Candidate (4.11 RC2) was released on 26 September 2012. It features the Linux 2.4 kernel.

Damn Small Linux-Not
Damn Small Linux-Not (DSL-N) is a similar Linux distribution that comes in a 95MB LiveCD. It has higher system requirements compared to Damn Small Linux. It's based on Damn Small Linux with a few differences, including SeaMonkey internet suite, and 2.6 kernel.