This Q&A lists free as in $0 workshops in GIS and related fields that have their material available to view or download online. The list is not limited to FOSS GIS, as GISers usually use a combination of open and closed source tools to accomplish their tasks. Some of these tools are easier than others and some are better documented. This list will be a great benefit to the community especially for new comers to the field.
General GIS
- GIS Project Video Tutorial on Acquiring, Analyzing, and Mapping US Census Data in QGIS from @A.S
- GIS Tutor: Beginner / Intermediate Level GIS from @radek
- BostonGIS from @simo
- Lectures on GIS for the Social Sciences from @ubernatural
Open-source GIS
- OpenGEO Education Center from @radek
- QGIS Videos (faunitalia) from @simo
- GIS SE Question: Geoserver Tutorials from @com
- GIS SE Question: Open Source Training Materials from @MarkIreland
- QGIS for Newbies from @IanAllan
ESRI Products
- GIS SE Question: Best place for (structured) ArcGIS tutorials from @robintw
- ArcGIS Automation and Programming from @Bethany
Transportation
These links include either theoretical or applied transportation knowledge in transportation planning
- GIS primer for Transportation
- Transit Capacity and Quality of Service Manual
- UrbanSim: FOSS Urban development, socio economic, and land use planning package
- MOVES(Motor Vehicle Emission Simulator) Workshop and technical background
- Transit GIS tutorials
- Remote sensing in transportation workshop
- Florida's CBT planning model explained