Links:

C short course lecture notes
www.tenouk.com
Visual Studio Community Edition
Using Pelles C & Visual C++
JTC1/SC22/WG14
C89/C90/C95, C99,...,C18
ISO/IEC  9899:2011
American National Standards Institute
Embedded C also included under WG14
Secure  C coding standard
Monthly  TIOBE Programming Community Index
The Transparent Language Popularity  Index
Programming Language Popularity at GitHub