http://raspberrypi.org/curriculum/archived/key-stage-3 - Raspberry Pi Foundation KS3 computing curriculum. A full mapped and resourced three year curriculum.
https://editor.raspberrypi.org/en/ - Respberry Pi Foundation code online code editors for HTML and Python.
https://codeclub.org/en/learn-to-code - Raspberry Pi Foundation code club with full pathways in Scratch and Python. Students will need a recent version of the Scratch IDE installed on a computer. They should also create an account with their school email on first use. This allows them to save and restore progress in projects. Suitable for all of KS3.
https://wordsmuggler.com/Smuggler - Demonstrates different forms of text encoding.
https://docs.google.com/spreadsheets/d/1ScgUDqpnPkSDIYd8tfLFyjsx2xJ5n0-2/edit?usp=drive_link&ouid=107038113625413919654&rtpof=true&sd=true - Excel spreadsheet to teach binary numbers.
https://forms.cloud.microsoft/Pages/ShareFormPage.aspx?id=aJZiyMLOgk2eF1spYYR4tIY8IvKY_spOqulHnXHJX-pUQ1Y3R1I2NTFTU1AwNVMySFBJQ1dLSTNTTy4u&sharetoken=fYv7egpwMj1DB6j28yWE - Example of an end of unit assessment I set up in Microsoft forms. These can be created with rubrics for marking and the data is automatically collected in an Excel Spreadsheet.
https://www.codesters.com/curriculum/hour-of-code-2022/Etch-a-Sketch/1/ - Hour of code projects in Python. Accessible block based coding with a full programming interface. 6 different hour-long games to code. Suitable for Yr 8/9
https://www.codesters.com/HoC/?lang=en - Additional hour of code resources.
https://codecombat.com/play/dungeon?hour_of_code=true  - Blocks to Python (or JavaScript or Lua) coding through gaming.
CodeCombat is free for individual users so don't set up teacher account or classes. They do need to select the correct options for their character so they are coding in Python using blocks and text.
https://compute-it.toxicode.fr/?hour-of-code&progression=python
https://www.rodocodo.com/hour-of-code/rodocodo-code-hour/
https://app.codemonkey.com/courses/blocks-hour-of-code#9
A great set of algorithm based challenges that are highly accessible for all of KS3.
https://www.advanced-ict.info/theory/NC/scheme_1.html - A full KS3 SoW for computing with lots of resources linked. This course is designed to lead to GCSE computing, so a lot is quite high level.