What could be a non structured software for drawing, text, mind-mapping something to quickly lay down your ideas, Similar to VUE but much more liberal with respect to the following points:
- Preferably open source.
- Freely sketching at any part of the document.
- Placing Images(any size) at any part of the document.
- Placing text at any part of the document.
- Linking up the above blocks using various elements.