Software
LibreOffice – https://www.libreoffice.org/
Ubuntu Linux – http://www.ubuntu.com/
Debian – https://www.debian.org/
Open Sankore – http://open-sankore.org/
FreeMat – http://freemat.sourceforge.net/
Yenka – Free Simulation Software
Stellarium – http://www.stellarium.org/
Study
Pomodoro Study Method – http://pomodorotechnique.com/
Tomato Timer – http://tomato-timer.com/
AQA Past Papers – A-Level Maths Past Papers
AQA Past Papers – A-Level Physics Past Papers
SQA Website – Past Papers for Maths and Physics
School Workout Maths – A-Level Maths Revision
Motion Mountain – Free Physics Textbook
Open University – Study Skills
Study Guides – Helping Learners
Mind Tools – Essential Skills
Skills for Learning – Support for Learners
GCSE Maths Courses – Worksheets & Notes
GCSE Maths Video Tutorials – MathsWatch