partition app?

hi professionals,
do you use a partition app or know one?
i tryied here search for this word, no app found.
the issue is to hopefully make system partition bigger.
i see seem to have quite few partitions.
perspectively need app, in middle time.
try to rescue first by cleaning.
maybe windows can clean or shrink also, as cleaner, setted middle dangerouse, no much help.
i was not sure which underforum best, let us talk short about possibly getting here an opensource app.
by such sensible system touching would be wide used opensource app quite have to.
maybe without the just found big livesystem GParted, instead a app?
million thanx!

EDIT
semi portable app by developer would be quite ok i think.
opensource high prio.
don't put me on cross, we need to get ...
i try my best for all, but of healt issues can't make you very happy.
have to manage all, instead of make all happy!
thanx for understanding and politeness!
let be all nice, helpfull and make the world great!

EDIT2
found only GParted. opensource, livesystem.
very big.