Boa is a simple, very fast and extremely small-footprint web server.
 Why you would want Boa
Boa is the perfect choice for serving static content. It does not support php and has very limited support for cgi-bin.
Boa is perfect for serving static content like images. Slashdot uses Boa as a dedicated image server for the images at that high-traffic site. Running Boa at port 80 at one IP on a server, or on a dedicated server, to take the load off apache (or another resource-demanding server) is a great way to make a high-traffic website faster.
 What you can't use Boa for
- Boa does not support IPv6, only the old (but still widely used) IPv4 Internet protocol.
- It does not run in chroot.
- The limited support for dynamci cgi does not support server-side includes.
- There is also no support for access control (HTTP authentication, etc.)
As of January 2006, Boa has the following limitations :
 In bullet summary
- Boa uses virtually no resources when serving static content like images at a fairly high load. It uses very little CPU and very little memory.
- Boa is perfect for running a simple website with static content and also perfect for taking the load of more advanced webserver-software running high-trafficed sites.
- Boa is also perfect for running a hidden Tor website.
 Some history
Boa was originally written Paul Phillips. It is currently being maintained by Larry Doolittle and Jon Nelson.