Thanks for the info about Sunbird, I had the understanding that some code was shared, but wasn't sure how much. I'll update it's description at some point.
You bring up good points about stuff like forks, internal tooling, and hosted versions. Up until now I haven't included forks and hosted versions that didn't make significant changes (which is why I included MXR and not the LXR instance). I'd like to include internal tools where possible, but I think the main obstacle is finding sufficient info.
I think where this differs from Killed by Google is that Mozilla has had less consumer services that were discontinued while they had an active user base. I'm happy to include old experiments, internal tools, etc., I really enjoy digging these things up.
Thank you again, I'll take a look at some of the services you mentioned!
