SharePoint 2013 Foundation (SPF) and Server (SPS) SharePoint 2010 Foundation (SPF) and Server (SPS) Windows SharePoint Services (WSS) 3.0 / Microsoft Office SharePoint Server (MOSS) 2007
SPF & SPS 2013 • 2010 • 2007
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Download SharePoint Add-Ons:

All software downloads below (about 3-8 MB each) are free and fully functional.

Each contains: Setup Wizard with SharePoint "Farm Solution Packages" (WSP files),
all in English and German — as well as:

Documentation: integrated in SharePoint (upon solution deployment) under Site Settings / <Product>Zen Studio / Help Topics (English and partially German)

Extract the Setup Package on your SharePoint primary farm server (logged into Windows as a SharePoint Farm Administrator). From there, follow the Installation section in the accompanying readme.html document.