Libraries to access Pin (pin.net.au), Stripe (not yet complete), Twilio (almost complete). My own bindings to SQLite. Libraries to write Latex files. Currently writing web server proxies for accessing Australian government mandated web services. None are yet released, but I am aiming to make a commercial service out of them so they may never be open sourced.

Pin employee here, if you've built something that supports us we'd love to add it to our integrations page.