It explains how to add Add-ons from files (mouse-over on the Download button). Icedove/iceowl Add-on search has an option for installing from a file.
I couldn't load a data frame saved inside an rdata file because the name started with a number. The solution was to do;
new.data <- `123old_data`
Make sure to use backticks.
I used these several times and like them.
"hind-cite is a set of tools & data for analyzing the time-based performance of Hacker News posts."
Real-time collaboration within Emacs/vim/etc using a proprietary network service. Like what gobby/rudel is supposed to do but less free!
I don't really like this website.