Here is another update. Internally, some components are quite ready by now. There is a working text search engine, an item data base, an inference engine, a rule engine. All of them are memory-efficient and fast. A link to an existing wiki (JspWiki) has been done. The new wiki parser is not perfect yet, but most parts work. This sound too technical? Look at the screenshot:
Figure 1: Working prototype, as of 2014-06-18
To make reading easier, here is what it says on the front page (copy and paste from HTML rendering):
Welcome to DenkWerkZeug
DenkWerkZeug is a tool (at which you look right now) to structure your thoughts, data and arguments. Probably you can also use it to manage your to-dos, as every tool is used to manage to-dos anyway.