Multi-Tiered System of Supports (MTSS)
Many free, evidence-based interventions here for academic and behavioral needs. I have used this site extensively to find interventions and assessment protocols. Navigation is very self-explanatory. I suggest you begin with clicking "Academic Interventions" or "Behavioral Interventions" at the top.
The Florida Center for Reading Research
Explore the center activities, organized by grade level and by reading skill components. You will find hundreds of free, printable activities with multi-sensory reading strategies. I have used these for small group phonics lessons with my beginning or struggling readers.
TPRI - Early Reading Interventions
Find intervention ideas for Buddy Reading, Timed Repeated Reading, Alphabet memory games, and more
National Center on Intensive Intervention
Scroll through these Mathematics lesson plan ideas, for evidence-based intervention resources. These are designed for learners with some of the most intensive educational needs.
University of Missouri: Evidence-Based Interventions
In the right side column, click on Behavior, Math, or Literacy interventions to download the intervention plans.
Massachusetts Tools for Schools
This site includes a clearinghouse of resources, organized by topic.