BRUSHES FROM:
!iceytina (https://www.deviantart.com/iceytina) :iconibelonginnarnia: :iconPStoGIMPbrushes: :iconashadevirasa: :iconProject-GimpBC: :iconagent-provocateur:
PATTERS FROM:
:iconiceytina:
FONTS FROM:
http://www.dafont.com/
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I will update this list when needed.
Right now I'm quite happy with what I've got. iceytina (https://www.deviantart.com/iceytina) really has a great gallery full of amazing brushes, not only for GIMP, but for PS and PSP also. (Lots of credits for her, and her resources [remember to check them too], since most of the brushes I use are snatched from her gallery.)
ALSO CREDITS for these people, who have allowed their PS/PSP brushes to be converted for GIMP, .gbr.