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OpenSSL

Get the contents of a CSR
openssl req -noout -text -in domain.com.csr
Get the contents of a CRT or PEM
openssl x509 -noout -text -in domain.com.crt
openssl x509 -noout -text -in domain.com.pem
See if a web server is using SSLv2
openssl s_client -connect localhost:443 -ssl2
See if a web server supports low ciphers
openssl s_client -connect localhost:443 -cipher LOW:EXP