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Isotoxin is multiprotocol secure messenger for MS Windows. Audio and video calls (like in Skype). File transfer. Supported protocols: Tox, XMPP. Portable. Multiple profile. Multilingual. Metacontacts. Spell check. Autoupdates. Unique skinnable UI. Profile encryption. Absolutely free. Desktop sharing via video calls. Tox group chats (and audio group chats). Encrypted profile support (including message history). User can create any number of independent profiles. Each profile includes protocol accounts, message history and conversation settings. Each profile saved into its own single sqlite db file. User can switch the current profile to another one at any time, without restarting. User can combine any number contacts in one metacontact with common message history.