Google Sketchup 8 Portable Free Hot! Download Link
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Free VFX Material - CG Render & Nuke Script

Free VFX Practice Material - CG Render & Nuke Script

Here you can download a complete project in FullHD for free that you can use in your tests and tutorial

Google Sketchup 8 Portable Free Hot! Download Link

The answer depends on your needs.

While SketchUp 8 (released in 2010) is now considered abandonware (no longer supported by Trimble, the current owner), downloading a "Portable" version from unofficial sources comes with significant trade-offs. google sketchup 8 portable free download

or sandbox to run the software if you are unsure of its origin. The answer depends on your needs