Sleipnir software (version 6.4.18) is a web browser with a variety of features such as customizable tabs, mouse gestures, and user-defined actions. It also includes a dual rendering engine, which allows for compatibility with a wide range of websites. Additionally, Sleipnir has a built-in RSS reader and can synchronize bookmarks and history across devices using the Cloud service. Finally, the software has a customizable interface with various skins and themes available.