Protocolos de Mensageiros Instantâneos

Comparison of instant messaging protocols

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Basic general information about the protocols: creator, version, amongst others.

	Creator	First public release date	License	Identity (not inc. alias)	Asynchronous message relaying	Transport Layer Security	Unlimited number of contacts	Bulletins to all contacts	One-to-many routing 4	SPAM protection	Supports groups or channels for members / nonmembers / nobody
Cspace	Cspace	17 July 2006	Open	Unique RSA-Key	No	Yes	Yes	No	No	No	No
Gadu-Gadu	Gadu-Gadu	17 July 2000	Proprietary	Unique number e.g. 12345678	Yes	No	Yes	No	No	Yes (simple)	Yes
IRC	Jarkko Oikarinen	August 1988	Open standard	Nickname!Username@hostname (or "hostmask") e.g. user!~usr@a.b.com 1	Yes, but via a memo system that differs from the main system	Yes, depending on individual server support	No 3	No	Simplistic multicast	Medium	Yes (everyone, multiple simultaneous, any size)
Meca Network	Meca Communications	Nov 2002	Proprietary	Username	Yes				No		?
MSNP (Windows Live Messenger, etc)	Microsoft	July 1999	Proprietary	E-mail address (Windows Live ID)	Yes	No	Only for certified robots	No	Centralistic	None	?
OSCAR protocol (AIM, ICQ)	AOL	1997	Proprietary	Username or UIN e.g. 12345678	Yes	Yes (Aim Pro, Aim Lite)	No	No	Centralistic	client-based	Yes (Multiple, simultaneous)
PSYC (Protocol for SYnchronous Conferencing)	PSYC Project	1995	Open	PSYC URI as in psyc://server.example.net/~nickname	Yes	Yes	Yes	Yes	Custom multicast	Yes	Yes (multiple simultaneous, any size, programmable)
Retroshare	Retroshare	21 March 2007	Open	Unique RSA-Key	No	Yes	Yes	No	No	No	No
TOC protocol (deprecated)	AOL	?	Proprietary	Username or UIN e.g. 12345678	Yes	No			Centralistic		paying members only
TOC2 protocol	AOL	Sep 2005	Proprietary	Username or UIN e.g. 12345678	Yes	No	No	No	Centralistic	No	paying members only
XMPP (Jabber)	Jeremie Miller, standardized via IETF	January 1999	Open standard	Jabber ID (JID) e.g. usr@a.b.c/home 2	Yes	Yes	Yes	Yes	Unicast lists	Several Standardized Types	Optional
SIP/SIMPLE	IETF	Dec 2002	Open standard	user@hostname	Yes	Yes	Yes	Yes	No	Medium	?
YMSG (Yahoo! Messenger)	Yahoo!	?	Proprietary	Username	Yes	No	No	Yes	Centralistic	Yes	No (groups discontinued due to liability)
DirectNet	Gregor Richards	January 2006	Open standard	Username							?
Zephyr Notification Service			Open standard								?
Gale	Dan Egnor		Open standard	Unique RSA key, aliased to user@domain		Yes (public/private key)					Yes (multiple simultaneous, any size, programmable, encrypted)
Skype Protocol	Skype		Proprietary	Username	No	Proprietary		No	Unknown		Yes