Gears API
I'm writing up a blog post about the early Mobile Web API's and Alex Russell reminded me of Google Gears Gears modules include: LocalServer Cache and serve application resources (HTML, JavaScript, images, etc.) locally Database Store data locally in a fully-searchable relational database WorkerPool Make your web applications more responsive by performing resource-intensive operations asynchronously Read full post. I think it is interesting to see that AppCache and WebSQL, Geolocation and WebWorkers came out of the ideas in Google Gears and it's only the latter two that really survived.