productivity - Software/App for electronic research notebooks

I want to keep a research notebook for my computational "experiments". Basically, I should at least be able to write text and attach images like plots. Other nice features to have would be

1. linking to past experiments/pages


2. latex equations


3. uploading papers, or other urls


4. being able to transfer data


5. dating and version control


6. open-source tool

I am already familiar with trello and tiddlywiki. Trello is good for attaching stuff and organising tasks, but I need a notebook where I attach a plot, write stuff around it, attach another below it. It doesn't have a paper or canvas. Tiddlywiki is a little painful for attaching pics and equations, the file bloats, it seems I am keeping a blog.

What is a good, free electronic notebook tool for research/lab work?