I assume you want to know what is the best RSS to work with Gengo on Linux. I have used Linux in the past and the best RSS reader to work with is Feeder.co, this is a paid service and runs on your favorite internet browser, despite your OS. As a second option and free, you could try https://quiterss.org/, just keep in mind that you won't get as many job notifications as with Feeder.co.
Best of luck!
Why do you think that you will get more jobs with Feeder.co?
It comes out of experience. But a more technical answer is because Feeder.co has a partnership with Gengo to provide fast access to their servers. You can find that info here in the forum. Besides, feeder.co has more dedicated filters and features that are very useful for Gengo translators. Beware though, feeder.co is a paid service, and for what I've seen in my pair languages there's not much work here in Gengo nowadays, so you will need to asses if you are willing to invest in it.