The first link I clicked on (the UK section[1]) was listed entire with jobs dated 2015. Even assuming some of those companies still have openings, seeing results that old immediately discourages me from investigating further on your resource. So it might be worth hiding expired positions from a UX perspective.
edit: The 2nd link I click on had jobs ranging from 2014 to 2012. I respect the effort you're putting into this curated list but displaying jobs that old is a little silly.
[1] https://www.fossjobs.net/jobs-in/United-Kingdom/
edit: The 2nd link I click on had jobs ranging from 2014 to 2012. I respect the effort you're putting into this curated list but displaying jobs that old is a little silly.