Google Gear is an answer to dojo's offline web applications. It is an open source browser extension that lets developers create web applications that can run offline. It consists of three modules that address the core challenges in making web applications work offline:
- Database - Store data locally in a fully-searchable relational database.
- WorkerPool - Make your web applications more responsive by performing resource-intensive operations asynchronously.
Google Mashup Editor provides simple tools and features that allow you to create mashups in minutes. Its still in the beta stage and is not available for the public. You need to sign up and wait for your account to get activated. For now all you have is the tour available to see the features.
So time also, Google have answered to Microsoft's Popfly and to dojo's Dojo Offline Toolkit and ya its also a release against the Adobe's Apollo and Dekoh runtime.