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


linking to past experiments/pages
latex equations
uploading papers, or other urls
being able to transfer data
dating and version control
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?
For the last month, I have been using Gitit for this purpose.  That link goes to a live demo where you can try it out.  It satisfies all your requirements:


It's a wiki, so you can easily make links between pages.
It's built on pandoc, which understands TeX and uses MathJax to render it (it technically renders a subset of TeX, but it's a pretty substantial subset)
It's actually a Git repository, so you can upload anything you want to it.  Or just put your figures out on the web (via figshare or a public Dropbox link) and link to them.
Same as 3.
Again, it's Git.
It is open source: https://github.com/jgm/gitit


As a bonus, you can put it out publicly on the web if you want (or just run it locally on your machine).  I run it on an internal server at my University and my students and post-docs use it to.  Thus it's a convenient way to share information as well.