RSIG - Remote Sensing Information Gateway offers a new way for users to get the multi-terabyte, environmental datasets they want via an interactive, Web browser-based application. A file download and parsing process that now takes months will be reduced via RSIG to minutes.
AirBase - the European air quality database maintained by the EEA through its European topic centre on Air pollution and Climate Change mitigation. It contains air quality monitoring data and information submitted by participating countries throughout Europe.
ECCAD - Emissions of atmospheric Compounds & Compilation of Ancillary Data.
CARMA - Carbon Monitoring for Action is a database containing information about the carbon emissions of over 60,000 power plants and 20,000 power companies worldwide.
NSR - Northern Sea Route Information Office.
SOLAS - Surface Ocean - Lower Atmosphere Study aims to quantify the exchange of gases and particles between the ocean and the atmosphere and to understand the role that these exchanges play in ocean biogeochemistry, atmospheric chemistry and climate.
Climate Data - the complete set of high-resolution climate grids available through the Climatic Research Unit and the Tyndall Centre, and some data-sets based on those grids.
IRENA - The Global Atlas is an online Geographic Information System (GIS) which enables to visualize information on renewable energy resources worldwide and to overlay information on protected areas, roads or infrastructure etc.
deal.II - an open source finite element library
CFD Online is an online center for Computational Fluid Dynamics. Services include several discussion forums, a jobs database, a free CFD reference in the form of a CFD-Wiki, a news and announcement forum, a books guide, an events calendar, and a comprehensive annotated link section with pointers to CFD resources around the world.
Lorena A. Barba group - a lot of open source codes, algorithms and tutorials.
Rosetta Code - programming chrestomathy site. The idea is to present solutions to the same task in as many different languages as possible, to demonstrate how languages are similar and different, and to aid a person with a grounding in one approach to a problem in learning another.
C/C++/FORTRAN/MATLAB Source Codes - Prof. John Burkardt source code library.
GAMS - Guide to Available Mathematical Software
The Glowing Python - A collection of sloppy snippets for scientific computing and data visualization in Python.
Pyvideo - plenty of python video tutorials and presentations.
SWIFT - parallel scripting language. Fast easy parallel scripting - on multicores, clusters, clouds and supercomputers.