Send Large Files

Transfernow
Free for up to 4GB
https://www.transfernow.net/en/

WeSendIt
Free for up to 5GB
https://www.wesendit.com/

SendSpace
Free for 300MB
https://www.sendspace.com/

WeTrasnfer
Free for 2GB
https://www.wetransfer.com/

Security Services

Have I been pwned
Check if email had been breached
https://haveibeenpwned.com/

RBLMon
Free RBL Black List monitor and alert service, up to 3 IP addresses.
http://www.rblmon.com/