Here are some of my favorite health related programs. The ergonomic programs are useful if you're spending long hours in front of your computer. The recipe and nutrition software can be used to improve your nutrition.
Ergonomic software
Workrave - available for Windows and Linux/POSIX operating systems
http://www.workrave.org/
https://portableapps.com/apps/utilities/workrave_portable
PrevRSI - available for Windows
http://prevrsi.sourceforge.net/
Xwrits - available for Linux/POSIX operating systems, X Windows based without a lot of GUI dependency libraries
http://www.lcdf.org/~eddietwo/xwrits/
Eyes' Thanks - available on Windows and other Qt supported platforms
https://github.com/yalov/eyes-thanks
Resto - available on Windows and other Qt supported platforms
https://github.com/Justyna-JustCode/Resto
RSIBreak - available on Linux and other KDE supported platforms
https://userbase.kde.org/RSIBreak
Gnome Break Timer - available on Linux and other GNOME supported platforms
https://gitlab.gnome.org/GNOME/gnome-break-timer/
Safe Eyes - available for POSIX compatible systems
http://slgobinath.github.io/SafeEyes/
Enso Retreat - available on Windows
https://github.com/GChristensen/retreat
Eyes Guard - available on Windows
https://github.com/avestura/EyesGuard
RestStop - available on Windows
https://gazugafan.github.io/RestStop/
WristSaver - available for Mac OSX
https://sourceforge.net/projects/wristsaver/
Stretchly - available on Windows, Linux, FreeBSD, Mac OSX and anywhere else Electron will run
https://github.com/hovancik/stretchly
BreakTimer - available on Windows, Linux, Mac OSX and Electron supported platforms
https://github.com/tom-james-watson/breaktimer-app
wnr - available on Windows, Linux, Mac OSX and Electron supported platforms
https://github.com/RoderickQiu/wnr
Chime - available on Mac OSX and Electron supported platforms
https://github.com/erdogany/chime
Aktivpause to Go - break reminder with exercises for Android
https://apt.izzysoft.de/fdroid/index/apk/org.secuso.aktivpause
Pausing Healthy - break reminder with exercises for Android
https://f-droid.org/en/packages/org.secuso.privacyfriendlypausinghealthily/
Mindfulness at the Computer is a breathing reminder - available for Windows, Linux, Mac OSX
https://sourceforge.net/projects/mindfulness-at-the-computer/
Breathing - available for Linux
https://github.com/SeaDve/Breathing
Breathe - available for Pebble
https://github.com/aaronhktan/exhale
Brethap - breathing app for Android
https://f-droid.org/en/packages/com.jithware.brethap/
Breathly - breathing app for Android
https://f-droid.org/en/packages/com.mmazzarolo.breathly/
Medito - meditation app for Android
https://apt.izzysoft.de/fdroid/index/apk/meditofoundation.medito
Mindfulness Meditation - meditation app for Android
https://f-droid.org/en/packages/biz.binarysolutions.mindfulnessmeditation/
Be Well - heart rate monitor
https://apt.izzysoft.de/fdroid/index/apk/com.bewell.lite
Virtual Magnifying Glass - available for Windows, Linux, FreeBSD, Mac OSX
https://sourceforge.net/projects/magnifier/
https://portableapps.com/apps/accessibility/virtual_magnifying_glass_portable
Adapt screen brightness/temperature on Windows and POSIX systems with Gammy:
https://github.com/Fushko/gammy
https://github.com/Fushko/gummy
Changes the color temperature of your monitor to better match that of your surroundings on Linux and Windows systems:
https://sourceforge.net/projects/redshiftgui/
Adjust colors of screen based on time of day on POSIX compatible systems:
https://wiki.archlinux.org/index.php/Redshift
Adjust colors of screen based on time of day on POSIX compatible systems:
https://github.com/maandree/blueshift
Iris Floss is a blue light reduction program for X11:
https://github.com/yurrriq/iris-floss
Gammastep adjusts screen colors for Linux systems:
https://gitlab.com/chinstrap/gammastep
Red Moon for Android:
https://github.com/LibreShift/red-moon
Fake Dawn is a gradual light alarm for Android:
https://f-droid.org/en/packages/org.balau.fakedawn/
Fall Detector for Android:
https://github.com/altermarkive/experimental-fall-detector-android-app
https://apt.izzysoft.de/fdroid/index/apk/altermarkive.guardian
Nutrition and Recipe software (cross-platform)
NUT - Nutrition software
https://sourceforge.net/projects/nut/
Gourmet - Recipe Manager
http://thinkle.github.io/gourmet/
EnRecipes - Offline recipe manager for Android.
https://f-droid.org/packages/com.vishnuraghav.EnRecipes/
Waistline - Libre calorie counter and weight tracker for Android built with Cordova
https://github.com/davidhealey/waistline
Ergonomic software
Workrave - available for Windows and Linux/POSIX operating systems
http://www.workrave.org/
https://portableapps.com/apps/utilities/workrave_portable
PrevRSI - available for Windows
http://prevrsi.sourceforge.net/
Xwrits - available for Linux/POSIX operating systems, X Windows based without a lot of GUI dependency libraries
http://www.lcdf.org/~eddietwo/xwrits/
Eyes' Thanks - available on Windows and other Qt supported platforms
https://github.com/yalov/eyes-thanks
Resto - available on Windows and other Qt supported platforms
https://github.com/Justyna-JustCode/Resto
RSIBreak - available on Linux and other KDE supported platforms
https://userbase.kde.org/RSIBreak
Gnome Break Timer - available on Linux and other GNOME supported platforms
https://gitlab.gnome.org/GNOME/gnome-break-timer/
Safe Eyes - available for POSIX compatible systems
http://slgobinath.github.io/SafeEyes/
Enso Retreat - available on Windows
https://github.com/GChristensen/retreat
Eyes Guard - available on Windows
https://github.com/avestura/EyesGuard
RestStop - available on Windows
https://gazugafan.github.io/RestStop/
WristSaver - available for Mac OSX
https://sourceforge.net/projects/wristsaver/
Stretchly - available on Windows, Linux, FreeBSD, Mac OSX and anywhere else Electron will run
https://github.com/hovancik/stretchly
BreakTimer - available on Windows, Linux, Mac OSX and Electron supported platforms
https://github.com/tom-james-watson/breaktimer-app
wnr - available on Windows, Linux, Mac OSX and Electron supported platforms
https://github.com/RoderickQiu/wnr
Chime - available on Mac OSX and Electron supported platforms
https://github.com/erdogany/chime
Aktivpause to Go - break reminder with exercises for Android
https://apt.izzysoft.de/fdroid/index/apk/org.secuso.aktivpause
Pausing Healthy - break reminder with exercises for Android
https://f-droid.org/en/packages/org.secuso.privacyfriendlypausinghealthily/
Mindfulness at the Computer is a breathing reminder - available for Windows, Linux, Mac OSX
https://sourceforge.net/projects/mindfulness-at-the-computer/
Breathing - available for Linux
https://github.com/SeaDve/Breathing
Breathe - available for Pebble
https://github.com/aaronhktan/exhale
Brethap - breathing app for Android
https://f-droid.org/en/packages/com.jithware.brethap/
Breathly - breathing app for Android
https://f-droid.org/en/packages/com.mmazzarolo.breathly/
Medito - meditation app for Android
https://apt.izzysoft.de/fdroid/index/apk/meditofoundation.medito
Mindfulness Meditation - meditation app for Android
https://f-droid.org/en/packages/biz.binarysolutions.mindfulnessmeditation/
Be Well - heart rate monitor
https://apt.izzysoft.de/fdroid/index/apk/com.bewell.lite
Virtual Magnifying Glass - available for Windows, Linux, FreeBSD, Mac OSX
https://sourceforge.net/projects/magnifier/
https://portableapps.com/apps/accessibility/virtual_magnifying_glass_portable
Adapt screen brightness/temperature on Windows and POSIX systems with Gammy:
https://github.com/Fushko/gammy
https://github.com/Fushko/gummy
Changes the color temperature of your monitor to better match that of your surroundings on Linux and Windows systems:
https://sourceforge.net/projects/redshiftgui/
Adjust colors of screen based on time of day on POSIX compatible systems:
https://wiki.archlinux.org/index.php/Redshift
Adjust colors of screen based on time of day on POSIX compatible systems:
https://github.com/maandree/blueshift
Iris Floss is a blue light reduction program for X11:
https://github.com/yurrriq/iris-floss
Gammastep adjusts screen colors for Linux systems:
https://gitlab.com/chinstrap/gammastep
Red Moon for Android:
https://github.com/LibreShift/red-moon
Fake Dawn is a gradual light alarm for Android:
https://f-droid.org/en/packages/org.balau.fakedawn/
Fall Detector for Android:
https://github.com/altermarkive/experimental-fall-detector-android-app
https://apt.izzysoft.de/fdroid/index/apk/altermarkive.guardian
Nutrition and Recipe software (cross-platform)
NUT - Nutrition software
https://sourceforge.net/projects/nut/
Gourmet - Recipe Manager
http://thinkle.github.io/gourmet/
EnRecipes - Offline recipe manager for Android.
https://f-droid.org/packages/com.vishnuraghav.EnRecipes/
Waistline - Libre calorie counter and weight tracker for Android built with Cordova
https://github.com/davidhealey/waistline