id	Specification	AbsoluteTelnet	Apache SSHD	AsyncSSH	Bitvise SSH	ConnectBot	cryptlib	Dropbear	Erlang ssh library	FlowSsh	Georgia SoftWorks SSH	iTerminal	JSch	JuiceSSH	libssh	libssh2	lsh	MindTerm	Mobile SSH	Mocca Telnet (iOS)	Net::SSH	OpenSSH	Paramiko	phpseclib	Poderosa	Prompt 2	PuTTY	Reflection (Android)	Reflection (iOS)	RLogin	salt	SecureCRT	Serverauditor (Android)	Serverauditor (Chrome)	Serverauditor (iOS)	SilverSHielD	SmartFTP	SSH.NET	SSHJ	Tectia SSH	Thrussh	TinySSH	TinyTERM (Android)	TinyTERM (iOS)	Tera Term	vSSH (Android)	vSSH (iOS)	WebSSH	Xshell 5		# of impls
none	RFC 4253	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes		47
zlib	RFC 4253	Yes	Yes	Yes	Yes	No	No	Yes	Yes	Yes	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	No	Yes	Yes	No	No	Yes	Yes	Yes	No	Yes	No	?	No	No	Yes	Yes	No	No	No	No	Yes	Yes	Yes	Yes	Yes		30
zlib@openssh.com	OpenSSH	Yes	Yes	Yes	No	Yes	No	Yes	Yes	No	No	No	Yes	Yes	Yes	Yes	No	Yes	No	No	Yes	Yes	Yes	No	No	Yes	Yes	No	No	Yes	Yes	Yes	No	Yes	No	?	Yes	No	Yes	No	No	No	No	No	Yes	No	No	Yes	No		24