Pinterest - This has been my #1 resource as far as ideas for anchor charts are concerned! Spending time on pinterest should really count for PD hours.
Teachers Pay Teachers - I constantly shop the free resources on the site and download them.
YouTube - I search YouTube for help on teaching different math skills to my students. I'm a visual learner so I need to see how it's done instead of just reading steps.
Teaching Channel - It's like YouTube for teachers only.
Periscope - Tons of great teachers are already on periscope including me! Check me out here and the iTeachTVNetwork
Teacher Blogs - Do you have a teaching related question - google it! I'm sure a teacher has already blogged about it.
Teacher Pop - This blog is great for new teachers.
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