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The Worlds leading desktop marker software. Epic Pen is an easy to use yet powerful desktop annotation tool for windows. You can draw, write and highlight directly over most Windows desktop applications, including presentation software, webpages, videos, universal annotation tool, creative studios and even games.

Free pdf books from Bookyards, one of the world's first online libraries to offer ebooks to be downloaded for free.

免费且开源的视频剪辑软件

Online math solver with free step by step solutions to algebra, calculus, and other math problems. Get help on the web or with our math app.

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PDF Shaper is an ultimate set of PDF tools for maximum productivity and document security. It allows you to convert, encrypt, sign and merge your PDF documents.