From here I gather these sort of things, that are chock full of goodies. This is just a small sample.
- easylist/easylist EasyList filter subscription (EasyList, EasyPrivacy, EasyList Cookie, Fanboy's Social/Annoyances/Notifications Blocking
- hl2guide/Filterlist-for-AdGuard-or-PiHole A very aggressive filter-list that consolidates over 370 lists for use in AdGuard Home, Pi-Hole or similar.
- ShiftyTR/Proxy-List Free proxy list UPDATED HOURLY! -- for api visit
- disposable/disposable-email-domains A list of disposable email domains
- tao-bai/attack-and-defense-methods A curated list of papers on adversarial machine learning (adversarial examples and defense methods).
- alecmuffett/real-world-onion-sites This is a list of substantial, commercial-or-social-good mainstream websites which provide onion services
- datasets/s-and-p-500-companies List of companies in the S&P 500 together with associated financials
- aquasecurity/vuln-list NVD, RedHat, Debian, Ubuntu, Alpine
- hilmanski/freeStuffDev list of free stuff for developer
- Naunter/BT_BlockLists Transmission block list
- NexClipper/exporterhub.io A Curated List of Prometheus Exporters
- XIU2/TrackersListCollection Updated daily! A list of popular BitTorrent Trackers! / 每天更新！全网热门 BT Tracker 列表！
- donnemartin/awesome-aws A curated list of awesome Amazon Web Services (AWS) libraries, open source repos, guides, blogs, and other resources.…
- jnv/lists The definitive list of lists (of lists) curated on GitHub and elsewhere
- goldbergyoni/nodebestpractices The Node.js best practices list
- SummitRoute/aws_breaking_changes List of changes announced for AWS that may break existing code
- janmasarik/resolvers List of periodically validated public DNS resolvers