For a two to three years i was running in a VPS server in VPSLink which had about 64MB of RAM - for everything and without swap space. The target use of this VPS was probably as an email server or something as most people recommended the more expensive 128MB and 256MB plans for serving (static) pages. And actually there were only about 40MB left since the OS needed some memory for itself too.

Personally i thought that with better resources management i could do much more, so i wrote a custom HTTP server in that could fit in less than one MB of RAM. Most of my pages were generated offline using a custom program in FreePascal.

The server could also execute CGI scripts, so i also wrote a forum in FreePascal.

According to my logs, the whole system ran out of memory only once :-). Until the day i decided to give myself a little more features (when i got a much better VPS from Linode) i had about 5-6 sites running (different domains), a Subversion server and a few "dynamic" apps.

The forum can be found here. I still run it in my new VPS, although it got some spam. The a + b = ? anti-spam feature was new when i wrote the forum but seems that bots got better :-P.

http://www.badsectoracula.com/projects/mforum/