SSL is a simple command line utility to get common information from an SSL/TLS endpoint. For example if you want to find out when a cert expires. An example is show below in the Usage section. All of this information is available via other tools but ssl is very simple with no arcane syntax to remember.
Binary releases for common platforms are available on the Github releases page.
$ ssl google.com gmail.com
google.com:443
Expired: false
Start: 2019-03-01 09:43:57 +0000 UTC
End: 2019-05-24 09:25:00 +0000 UTC
Valid Host: true
Version: TLS 3.0
Cipher Suite: ECDHE_ECDSA/AES_128_GCM/SHA256
gmail.com:443
Expired: false
Start: 2019-03-01 09:28:34 +0000 UTC
End: 2019-05-24 09:24:00 +0000 UTC
Valid Host: true
Version: TLS 3.0
Cipher Suite: ECDHE_RSA/AES_128_GCM/SHASSL does not currently report all possible SSL/TLS ciphers. Only the cipher that the client/server agreed upon.