We've recently started up a section of our site dedicated to what we call 'OnSIP extras'. This new page will include all our integrations with the existing applications and services you may already be using, as well as hacks and plugins such as our various click to call add-ons that turn phone numbers into clickable links in your browser.
This is just the tip of the iceberg. We hope to be adding many more 'extras' as we create partnerships with other business communications services. Our developer API also allows any OnSIP user to contribute plugins. Who knows? You may be using OnSIP in creative ways we've never even considered.