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2 points by akkartik 2171 days ago | link | parent is probably the major service using Arc.

I ran a feedreader at for 3 years, but haven't kept it up lately. It had a feed crawler using Python but the rest was in Arc. The codebase is at (I gradually got into improving the Arc stack rather than that particular app atop it, leading to my next couple of projects: and Both are heavily inspired by Arc.)

You might find this old thread useful:

1 point by kinnard 2171 days ago | link

That is helpful. Thanks.