You found some bookmarks.
These are places or blog posts from around the internet that I have found particularly useful.
Active Calculus
Free resources for Calculus students and instructors
Paul’s Online Math Notes
Online notes for Algebra, Calculus, Trigonometry, and Differential Equations
The Asymptotic Cheat Sheet
To help remember what exactly is meant by “Big O notation”
The Not So Short Introduction to LaTeX
It’s not so short, and a great place to start learning LaTeX
Package Users
A strategy for managing locally installed software using only Unix built-ins
skarnet.org
High quality software, including a set of general-purpose C programming
libraries, the execline scripting language,
and a suite of small and secure supervision utilities
Void Linux
Looking for a Linux distribution?
Void Linux is robust, versatile, and usable.