www.scribus.net
Windows, Mac, Linux
Scribus is a professional page layout application. It can achieve desktop publishing documents that are similar to what PageMaker, PagePlus, QuarkXPress and InDesign can make.
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www.seamonkey-project.org
Windows, Mac, Linux
SeaMonkey is the reincarnation of Mozilla. SeaMonkey comes with an web browser, email program and webpage composer.
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Download in the macOS App Store
sourceforge.net/projects/seashore
Mac
Seashore is a raster graphics editor. Seashore is similar to Paint.Net for Windows.
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www.shotcut.org
Windows, Mac, Linux, BSD
Shotcut is a video editor that supports videos up to 4K.
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github.com/google/spatial-media/releases
Windows, Mac
Spatial Media Metadata Injector converts mp4 and mov videos to 360 degree VR videos
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www.SchoolFreeware.com
Windows, Mac
SpeakABCs is a simple program that teaches children their ABCs.
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www.microsoft.com/en-us/sql-server/sql-server-downloads
Windows
SQL Server is a relational database management system (RDBMS) that is powerful and secure.
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www.stellarium.org
Windows, Mac, Linux
This software displays the sky and location of the heavens for the past, present, and future time and dates.
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www.supertux.org
Windows, Mac, Linux
SuperTux is a nonviolent game similar to Super Mario Brothers.
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supertuxkart.net
Windows, Mac, Linux
SuperTuxKart is an 3-D arcade racer similar to Super Mario Kart.
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www.synfig.org
Windows, Mac, Linux
Synfig Studio is free 2D animation software. Synfig is an app similar to Adobe Animate.
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