MathPapa - Solves Algebra problems for you step-by-step
NumWorks - The graphing calculator that makes learning math easier.
Shiny Things - Perfect for students to improve their math abilities
Learney - Knowledge aggregator for developers
eMathHelp.net - Site is created to help people learn math. Includes algebra, calculus, differential equation calculators and notes with many examples.
Texpad - LaTeX editor for macOS, macOS, iOS, iPad, iPhone and iPod Touch, with syntax highlighting, multi-file support and integrated PDF