mrd-lib is a repository of Emacs Lisp code that I use.

mrd-url and mrd-org-cmd are loosely based on org-protocol, but simpler and using a more (IMO) structured URI scheme. To enable it on Ubuntu, use:

gconftool-2 -s /desktop/gnome/url-handlers/mrd-org-cmd/command '/path/to/mrd-url-open %s' --type String
gconftool-2 -s /desktop/gnome/url-handlers/mrd-org-cmd/enabled --type Boolean true

mrd-org-smartwrap is an extension to make visual-line-mode work better with org-mode.