Software compatibility may vary from brush to brush— some will be for both Photoshop & Gimp, while others may just be for Photoshop. I personally use Photoshop (I think I've said that before?) but I'll try my best to find things that will work for others as well :-)

Tech Brushes — software not specified.
By: Jaaaiiro
Download Link: http://jaaaiiro.deviantart.com/art/Tech-Brushes-126815998

Glitter Brushes — Photoshop & Gimp.
By: redheadstock
Download Link: http://redheadstock.deviantart.com/art/Glitter-Sparkles-Photoshop-and-GIMP-Brushes-48646588

Icon Brushes — Photoshop
By: studioish
Download Link: http://studioish.deviantart.com/art/Icon-Photoshop-Brushes-v1-0-128124052

Tech Brushes — Photoshop
By: TomSimo
Download Link: http://tomsimo.deviantart.com/art/Tech-Brush-Set-By-TomSimpsonTS-276875373

Broken Glass Brushes — Photoshop
By: PerpetualStudios
Download Link: http://perpetualstudios.deviantart.com/art/Broken-Glass-Brushes-Eight-142202161

If you work strictly from phone/iPad/tablet I'm sorry but I don't think any of these will work for you; I will, however, be searching for textures similar to these brushes that can be used in Superimpose so stay tuned! I'm doing my best to find things that'll work for everyone.