http://nzbid.org/
Advertiser supported and reliable.
http://newz69.keagaming.com/
Free but limited to 15 nzbs and 300 API hits a Day. This is a Newsnab site. It decodes obfuscated headers and is almost spam free.
https://usenetindex.dk/
Relatively new, run by a hobbyist who gets free hosting. It's already better than many pay sites.
https://ssl.nzbsa.co.za/index.php
Usually is open and easy to get an invite if it's not open. This has a newsnab Backend indexer with a custom front end that has member uploads. It's mostly South African but seems to attract some Euros with fast connections who upload, repost and spot for them.
All of these are compatible with Sabnzbd, Sickbeard, Couchpotato etc
Contrary to popular belief, you don't have to spend any money to get newznab indexers
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