Oakland is especially well-represented in the node.js community, with Isaac Schlueter,Mikeal Rogers, and James Halliday, who all live in Oakland OR THEREABOUTS. Isaacs was formerly the lead of the node.js project and founded npm, the package manager where people publish open source node.js modules. The former cat shepherd of node.js, TJ Fontaine, lives in Alameda.
npm was originally written in Mountain View. However, it was subsequently largely rewritten in Oakland.
Couch One, the company behind couchdb, used to have its headquarters on Washington Street before it merged with membase and moved to Mountain View.
StackVM, the company behind Browserling, Testling, Testling-CI, and Substack, is 1/2 head quartered in Oakland.