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From right to left:
1.IPG imprinted on the nib,
2.Stilus 111 iridio marked on the barrel, 3.Pelikan/Pelikano,
4.another IPG,
5. Looks like Rexpen
6. and 7. Garant Alkor 'Iridium'
8. Montblanc Turbo

@MiaG
Are they all in working order? Do you have a favorite?

@SlowRain First one definitely isn't, tip of the nib is damaged. One of the Garant Alkor has tight piston filler and piston mechanism of the other doesn't work. I don't know how to disassemble it, also nibs don't look promising, which is very sad because this pen is one of my favourites. I already have one Garant Alkor that has broad nib, it works perfectly. These two have fine and extra fine nib.

@MiaG
I'm terrible at fixing things. Good luck. Do you think you could mix & match any of those, sort of Frankenstein a pen together?