Do you know about Add-Ons?

RSSOwl is based on a platform that can easily be extended with additional functionality. We provide some add-ons that are worth mentioning here. If you open Tools | Add-ons | Find Add-ons you see a list of available add-ons for your platform. The most popular one is likely the Newsgroup reader that turns RSSOwl into a nntp-client (find out more here). Another useful add-on that was recently added is the Offline Mode that allows to stop all network access from RSSOwl as long as the offline mode is active.

With the same mechanism, you can even install additional languages into RSSOwl. Find the list of additional languages from Tools | Language | Download Additional Languages.