This page is a big bucket of links that I have found useful or enjoyed during the course of my research. Please let me know if you have any suggestions or recommendations for me.

Code development
github: driftingtides

Organisations
International Association of Hydrogeologists
New Zealand Hydrological Society

Studying geoscience at Tübingen
Integrated hydrosystem modelling PhD program
Applied & environmental geoscience MSc program

Blogs that I like
GeoSphere - An EGU network blog covering many bases
Walking Randomly - Excellent and amusing writing about scientific computing
planetwater - The blog of Claus Haslauer (my supervisor)

Some fundamentals
SEPMStrata - Everything you ever wanted to know about sedimentary geology but in a way that everyone can understand
Paul's math notes - This website got me through the first semester of my MSc. Excellent theory and exercises in fundamental mathematics
edX - A good source of open courseware, or MOOCs if you prefer
BitBucket -  a good place to stash your codes
Purdue Online Writing Lab - This website will make you a better (at writing) person