Ages - kostenloses Unterrichtsmaterial, Arbeitsblätter und Übungen

The Middle Ages Interactive
Discover what it was like to live during the Middle Ages. Explore topics such as Feudal Life, Religion, Homes, Clothing, Health, Arts & Entertainment, and Town Life (Annenberg Learner 2021).  
The Castle through the Ages
Discover walled cities, warriors, mottes, and more
The Middle Ages 500 - 1500
Aus: The Past Online (Bildungsserver Rheinland-Pfalz 2015)
Botany Depot
This website provides creative ideas and materials for teaching botany for all ages and levels (USA: Rutgers University 2018).
NRICH: enriching mathematics
Resources for math teachers, parents, and students between the ages of six and eighteen (University of Cambridge 2015-21)
Teaching Strategies
Student-centered teaching strategies that nurture students’ literacy and critical thinking skills within a respectful classroom climate. The strategies suggested here can be used with students of all ages with any academic content (Facing History and Ourselves 2011) 
Teaching Strategies
Student-centered teaching strategies that nurture students' literacy and critical thinking skills within a respectful classroom climate. The strategies suggested here can be used with students of all ages with any academic content (Facing History and Ourselves 2011-20) 
Civics 101
The podcast refresher course on the basics of how democracy in the U.S. works distills government topics, such as the separation of powers and the electoral college, for listeners of all ages (USA 2020).
How to Learn Math: For Students
Stanford University offers this unique online course designed to help students of all ages and levels (and their instructors) develop ʺstrategies to learn and to relate to math well.ʺ (2017)
Lesley University Library: Biology
Created by subject librarians, the site includes data sources for those working with upper level high school students and includes teaching resources for students of all ages (USA 2014).