COVESA VSS Wiki
The wiki is a good starting point that leads/points to all of the other locations.  

Weekly Meeting - Weekly meeting time and link

GitHub
GitHub is where almost all of the VSS project work is maintained.  The main page contains links to   

• Documentation

• A straight forward set of topics that give a good overview of VSS

• Releases

• Release links with lists of what has changed

• Specification/Catalog

• VSS specification refers to the standard catalog. It is maintained in yaml.  It is fully expected that not everyone will implement all data elements/signals and they will likely implement some number of proprietary elements/signals.  VSS is still a useful methodology/rule set for defining interoperable models.

• Tools

• Tools are maintained in a separate repository

• GitHub Project wiki

• VSS project team uses the VSS wiki for documenting a variety of things including releases.

• Pull Requests 

• All edits and updates are presented to the team through Pull Requests and are discussed in weekly meetings.

• Issues

• All issues are tracked through GitHub issues

Implementations

There are many implementations of VSS over the years.  Here are the ones that I know about that are public:

• AOS Edge - A software first approach to the connected vehicle
• Eclipse Kuksa - Building blocks for the Software Defined Vehicle
• Repositories - scroll down to see the repositories
• AWS IoT Fleetwise - Fleet Management software
• Repositories
• W3C Vehicle Information Service Specification - data service for serving VSS data on multiple topologies

W3C Projects

• Vehicle Information Service Specification (VISS) 

• VISS Core

• VISS Transport

• Vehicle Signal Specification Ontology

• VSSo Core

• VSSo