Ruby is the principal maintainer of the Feed validator, which he developed along with Mark Pilgrim.
Ruby was the convener of the ECMA TC49 group that standardized the Common Language Infrastructure for Microsoft's .NET Framework.
[7][8] The project which eventually became the Atom web feed standard was started by a blog posting by Sam Ruby in 2002 entitled "what makes a log entry".
This blog posting eventually became a wiki project which acted as a rallying point for people looking to improve upon the frozen RSS format.
Ruby was an early adopter of HTML5, and has offered a number of concrete proposals which were subsequently incorporated into the HTML5 draft.