These are resources, not necessarily recommendations (though for some tools I've written a glowing review). Some are free and others are free to try then require purchase. Please check them out and decide for yourself if they will work in your classroom.
30 Ways to use Google Forms with Examples - scroll to second page of pdf for live links
Formative - create formative assessments in any subject area
Mote: a Chrome extension that adds voice notes and feedback to documents, assignments, and emails - makes giving student feedback easier and faster
Tackling the motivation crisis - Live binder with games, lessons, ideas, content, videos, and more
Radio Garden - Radio Stations from around the world
AI for generating tasks and activities for students
Frame - an immersive online space, right from the browser. Free and easy to use
Tiny Tap - interactive pre-made activities organized by subject matter and grade level
Ditch That Textbook - just an awesome resource - definitely check this one out!
EdShelf: "A socially-curated discovery engine of websites, mobile apps, desktop programs, and electronic products for teaching and learning."
Google Lens: “Just point your smartphone camera at an object, an image, even a plant, and the app can give you information about it. Point it at text in one language and translate it into another. Point it at a math problem and it will help you find a solution. Point it at any text...and the app will read it out loud to you.”
HippoCampus - anchoring or introductory videos in just about every subject matter
Project Zero Thinking Routines - from Harvard University School of Education
GooseChase: educational scavenger hunt app
Flippity - use Google sheets to create puzzles for studying - matching, crosswords, word search, scavenger hunts, bingo, word scrambles and more
Canva for Education - create media projects free for educators and students
Glogster - create online virtual posters for any subject - has library of existing posters for reference or use in class. Can even make a copy of an existing poster and modify for your use
Prezivideo: very cool presentation software for a different take on presenting with slides and video.
ExplainEverything: very cool digital whiteboard including animation and video creation
Winter Activities - adapt for any subject area