哪个开源项目最像Google笔记本？

As we knew, Google stopped the development of Google Notebook. Though lots of alternatives exist, no one satisfies me (see below for the reasons). Many suggest Google to open source it, but Google didn't response by so far. So I'd like to turn to open source world to develop one. In a nutshell, Google Notebook attracts me in the following ways: the development of G