My saved game of Fallout 4 completed with all 4 factions in .fos format, nothing more fancier than that.

Using these save files
>Unpack
>move/copy save file of you choice to your Fallout 4 save directory
>Launch game and you will see save file named (for example: BoSEnding)
> NOTE: you can only see named save files from the title screen upon launching the game, not while playing
>quick save or save while playing (so you can see it in the load menu everywhere)

save "recap"
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In all saves
Play time 8 days +
Player level ~75 (sneak , speech character)
Player perks chosen for 100% steam achievement purposes
Base/item/companion/power armor storage in Red rocket truck stop
Multiple settlements built and connected
Danse saved
etc must be more but I just wont list everything here
NOTE: mostly unmodded save BUT Starlight drive in -building cap made larger


Brotherhood of Steel ending
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starts ready to blow up Institute
Railroad killed (Deacon-companion dead)
Institute to be killed


Institute ending
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starts ready to talk to father
Railroad killed (Deacon-companion dead)
BoS killed


Railroad ending
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starts in their HQ (blew Institute already, oops)
BoS killed
Institute killed


Minutemen ending
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starts ready to blow up Institute
Railroad alive
BoS alive
Institute to be killed