Site Templates

2016

SharePoint Server 2016 RTM list of all templates
http://social.technet.microsoft.com/wiki/contents/articles/33939.sharepoint-server-2016-rtm-list-of-all-templates.aspx

2013

Web Template List
http://social.technet.microsoft.com/wiki/contents/articles/20149.sharepoint-2013-default-site-templates.aspx
Commonly used Web Templates
http://blog.areflyen.no/2014/08/05/common-used-web-templates-in-sharepoint-2013-with-screenshots/
Site Templates (all 17 w/ screenshots)
http://www.spjeff.com/2013/07/06/site-templates-all-17-w-screenshots/

2010

Good articles on selecting the right template

http://toddbaginski.com/blog/which-sharepoint-2010-site-template-is-right-for-me/

http://weblogs.asp.net/bsimser/archive/2010/07/27/sharepoint-2010-site-templates-a-detailed-journey-part-1.aspx

Free – Vendor

Free Project Templates

https://www.brightwork.com/resources/free-sharepoint-project-management-templates

Cost – Vendor

https://directory.collab365.community/office365-sharepoint/best-sharepoint-intranet-templates/

SharePoint Templates

Fab 40
http://thecloudengineer.blogspot.com/2011/07/fab-40-support.html

Great Template overview
http://weblogs.asp.net/bsimser/archive/2010/07/27/sharepoint-2010-site-templates-a-detailed-journey-part-1.aspx

Why is the provisioning model such an important thing? 
SharePoint 2010 and web templates
http://blogs.msdn.com/b/vesku/archive/2010/10/14/sharepoint-2010-and-web-templates.aspx