OSDB: The Open Source Database Network
osdb: because you can
osdb is the open source database network
rstudio.org
data.NASA
LabKey Software Foundation
visualizing.org
OpenSABR
Open Database License
Tools
MySQL Workbench
PostgreSQL
Postgres Weekly
CouchDB
Valentina Studio
EMS SQL Manager
Crash Course
The Practical SQL Handbook
Seven Databases in Seven Weeks: A Guide to Modern Databases and the NoSQL Movement