Their mission:

To support every teacher in the world in developing the next generation of compassionate, resourceful, and iterative learners.

Source: BetterLesson | Professional Learning Reimagined

BetterLesson provides access to thousands of free lesson plans and resources. These lesson plans are groups by subject, grade level and standard.

Beyond the lesson plans is a thorough and comprehensive professional development, offering several different workshops and other opportunities for your school district. Unfortunately the site breaks my number 1 rule for vendor sites and lacks any sort of pricing information. I assume if the pricing isn’t listed, we can’t afford it. If you have experience with their workshops, please let me know!