Platform · 2005–now · Web Boom
Git
Distributed version control that ate the industry. Merge pain remains; centralized SVN does not.
Git stuck because branching and offline work match how software actually gets written. GitHub turned it into social infrastructure, not just a tool. Everything else is legacy migration waiting to happen.

Context
The browser ate the desktop
The web became the default delivery surface. LAMP and Rails made shipping cheap; Ajax made pages feel like apps; SOAP/SOA tried to enterprise-ify the wire. REST won by being debuggable with curl. This decade invented the modern product cadence — and the habit of treating every new framework as destiny.
Compare with
Related
Practice · 2001–now
Agile (as practiced)
Individuals and interactions — then SAFe slideware. The manifesto stuck; the ceremony industrial complex is the fad layer.
Platform · 2011–now
Jenkins
Plugin palace CI that defined pipeline culture — and Groovy nightmares. Still running somewhere in your org.
Platform · 1991–now
Linux
The production OS. Cloud VMs, containers, phones, routers — the penguin ate the datacenter.