Perkeep (previously Camlistore) is a set of open source formats, protocols, and software for modeling, storing, searching, sharing and synchronizing data in the post-PC era. Data may be files or objects, tweets or 5TB videos, and you can access it via a phone, browser or FUSE filesystem.
Meemo is a personal data manager. It lets you simply input any kind of information like notes, thoughts, ideas as well as acts as a bookmarkmanager and todo list. The user interface resembles a news feed organized with tags. Full text search further allows you to quickly find information in your pile of accumulated data.