Open-source softwareSimple Chat is is absolutely free and open source software.Simple Chat is released under the terms of the GNU GPL version 3.
Simple Chat officially supports most popular desktop operating systems such as Windows, OS X and Linux.
Multiple loginSupports multiple login on same account from different places.
OAuth 2.0Supports sign up via Facebook, Google, Windows Live, GitHub, VKontakte, Yandex, Оdnoklassniki and Mail.Ru.
File transferFile transfer use direct connections between users.
Animated emoticonsAnimated emoticons included in the standard distribution.
Spell checkingIt supports all of Hunspell dictionaries.
Rich text messagesSupports visual message formatting (bold, italic, underline and strikeout) and also multiline messages.
Offline messagesMessages will be delivered, when recipient connects to the chat.
Sound notificationsSupports sound notifications.
Popup notificationsSupports popup windows.
PluginsBoth client and server support plugins to extend the functionality.
SSL encryptionConnection between client and server is encrypted using SSL.
Geo IPServer has a built-in support for determining country.
Automatic updateSupports automatic update for Windows and notification of new versions for other operating systems.
RoomsSupported functionality similar to IRC channels.