[gargs]

This was my immediate thought upon seeing the title! I used to love the library telnet server, which worked for searching, placing a hold, renewing, and even inter-library loans. There was also rudimentary full-text search of engineering journals. Today, it's a 'modern' website with tons of whitespace, non-customizable fonts, and links out to events and what not. Simplicity is such a wonderful feature and yet it's somehow completely orthogonal to modern engineering.