Boa (web server)

Boa is an unmaintained since 2005 open-source small-footprint web server that is suitable for embedded applications. Originally written by Paul Phillips, it was previously maintained by Larry Doolittle and Jon Nelson.
Slashdot and Fotolog use Boa to serve images.
As of its last release, Boa has the following limitations:

No access control features
No chroot option
No Server Side Includes
No SSL support although there are some patches against 0.94.13 that introduce SSL support

As of 2022 Boa is still used in many embedded applications, and its known vulnerabilities have been actively exploited.