Celestia - تصور ثلاثي الأبعاد للفضاء في الوقت الفعلي محاكاة المساحة الحرة التي تتيح لك استكشاف كوننا في ثلاثة أبعاد. على عكس معظم برامج القبة السماوية ، لا تحصر Celestia…
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Extensible Messaging and Presence Protocol (XMPP, originally named Jabber) is an open communication protocol designed for instant messaging (IM), presence information, and contact list maintenance. Based on XML (Extensible Markup Language), it enables the near-real-time exchange of structured data between any two or more network entities. Designed to be extensible, the protocol offers a multitude of applications beyond traditional IM in the broader realm of message-oriented middleware, including signalling for VoIP, video, file transfer, gaming and other uses.
an open and secure protocol, which is not asking for any trades. There are many clients to use it: https://xmpp.org/uses/instant-messaging.html