Links
Mathematical Tools and Resources
Online Encyclopedia of Integer Sequences
Superseeker: An e-mail server that uses the OEIS and many other things and tries very hard to find an explanation for a number sequence.
Plouffe's Inverter: A decimal expansion to symbolic expression converter
Sage: Open Source Mathematics Software
Peter Alfeld's Applet for Minimal Determining Sets
Wolfram|Alpha: A computational knowledge engine
GeoGebra: Free mathematics software for learning and teaching
nLab: A mathematics wiki that spawned from the n-Category Cafe
The Stacks Project: An open source textbook and reference work on algebraic stacks
DLMF: NIST Digital Library of Mathematical Functions
Math Overflow: An interactive mathematics website based on StackExchange
ImageJ: Image processing and analysis in Java
Univariate Distribution Relationships:
Visualization
SURFER: Visualization of Algebraic Geometry
Algebraic Surface Homepage: Pictures and animations of algebraic surfaces
Publishing
Sherpa Romeo: Publisher copyright policies & self-archiving
Arxiv: e-Print archive
MathSciNet: Mathematical reviews and references (subscription only)
The Science Code Manifesto:
Norsk samfunnsvitenskapelig datatjeneste:
Scientific journals, series and publishers
Caltech Library: Journal Title Abbreviations
Beall's list: potential, possible, or probable predatory scholarly open-access publishers
Editing
ExifTool: To remove all metadata from a file: "exiftool -all:all= file.pdf"
Presentation
Presentation Zen: Garr Reynold's blog on issues related to presentation design
Fun and Games
Ancient Greek Geometry: Create geometric figures with ruler and compass
Miscellaneous
Data analysis: a (not so) silent revolution: The problem with p-values