The Safe Browsing service powers a big red warning page in most major browsers.
Netcraft have browser extensions that warn phishing victims and they work with providers to take down reported sites.
Microsoft run their own scheme to flag suspsicious sites.
VirusTotal aggregate many different phishing and malware detection products and let you submit to all of them in one go.
urlscan.io is a free service to scan and analyse websites using a headless browser. It lets researchers pivot to find similar phishing sites.
OpenPhish is a fully automated self-contained platform for phishing intelligence. It identifies phishing sites and performs intelligence analysis in real time without human intervention and without using any external resources, such as blacklists.
PhishFeed is an automated detection and takedown product run by WMC Global.