N1MM Logger 
The most full-featured contest logging program available at any price -- and it’s FREE! 

https://n1mmwp.hamdocs.com/n1mm-features/

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TR4Win 
Freeware, based largely on source code of the TR LOG MS-DOS program, kindly provided by Larry Tyree, N6TR (author of TR LOG)

http://tr4w.net/

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WriteLog 
Time-tested and stable contest logging program 
http://www.writelog.com/

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TRLog
Authored by avid contester Tree N6TR
http://www.trlog.com/

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DX Zone comprehensive software list

https://www.dxzone.com/catalog/Software/Contesting/

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Digital Mode Guides & Tools

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FT-8 Operating Guide by Gary Hinson ZL2IFB

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Select icon to open downloadable.pdf

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Quick Start Guide to WSJT-X by Joe Taylor K1JT

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Select icon to open downloadable.pdf   

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Ham-related Apps for Android or I-phone

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RadioFidelity article on apps for hams

https://radiofidelity.com/best-ham-radio-app-for-android-and-iphones/

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DX Zone Comprehensive list of apps:

https://www.dxzone.com/catalog/Software/Android/