Archive copies of historic SSL protocol specifications: 

• SSLv2, aka SSL version 0.2, Kipp Hickman, Feb 9, 1995, as MHTML  , or as PDF (downloaded from Mozilla's website)  

• The SSL Protocol - draft 0.1 of version 3, also discussing version 2;  Kipp E.B. Hickman and Taher Elgamal, June 1995

Data sources and testing resources:

• The OWASP Webgoat project for experiments in web (in)security

• The DeterLab testbed

• CAIDA tools, e.g., BGPstream - BGP data analysis

• RIPE Atlas - probes to test connectivity

• DNSVis - visualization of DNS and DNSSEC information

This is a very partial list, I should extend it...  suggestions will be appreciated.