dnschecker – https://dnschecker.org
MultiRBI checker – https://multirbl.valli.org
DNS Info – https://intodns.com/
SMTP tester – https://smtp-test.com
SSL Labs – https://www.ssllabs.com/
PCI Checker (not used ) – https://www.pciscan.org
DNetC stats – https://stats.distributed.net
Podcasts
Destination Linux – https://podcast.destinationlinux.org
Late Nite Linux – https://latenightlinux.com/
BSDs
FreeBSD – https://freebsd.org
NetBSD – https://netbsd.org
OpenBSD – https://openbsd.org
DragonFly BSD – https://www.dragonflybsd.org
GhostBSD – https://ghostbsd.org
Linux distros I use/like