This blog has a little bit of everything. There are links to activities, lesson plans, games, and the NLVM (National Library of Virtual Manipulatives).
This is a great site that links to a list of apps that would replace the manipulatives that we use to use-like protractors, geoboards, etc.
This is a great site that has a lot of puzzles and real-world problems available. Most have a little bit of history and/or mathematics background to make connections to content easier.
I chose to add this to my list because there are classroom management systems listed here. Some of them I have heard mentioned and others are brand new!
There are STEM lessons here for high school teachers, virtual field trips, and tips for changing assessment to match changing technology. Middle school and elementary teachers will find lots of lessons here too.
This is a great site that includes lessons for increasing kids' digital literacy and citizenship. There are also links for teachers (including a great tutorial on webquests).
This is an interesting collection of trends focusing on mobility of learning. There is also a link to a discussion about the trend of gamification.
I saved this list for future reference. This is a great list to refer back to for research purposes. This site could easily spawn its own list. I also think it's interesting that it listed all of the things trending down.
This is a great site reviewing the tools of last year. There are links for collaboration with 1:1 and delivery methods that I found very helpful.
