Here are some blogs that use GeoGebra:
- Mathematics and Multimedia (my main blog). Contains more than 50 GeoGebra tutorials.
- Calculus Learner
- Great Maths Teaching Ideas by William Emeny
- I hope this old train breaks down by Mimi Yang.
- Math Hombre by John Golden
- Mathematics for Teaching by Erlina Ronda
- Warwick Blog