It is always amazing to see the technology that we strive to make possible being implemented and used by people and artists all around the world. This is a place to share what technology is available out in the wild.
Apps:
BeCasso (Oil and Watercolor filtering) using technology from Semmo et al., Wang et al. and Bousseau et al.
Prisma (Neural networks stylization) using technology from Gatys et al.
PaintCan (Oil painting from photography) using technology from Winnemöller et al.
SnapDot (Stippling filtering) using technology from Adrian Secord
PencilFX (Pencil drawing filtering) using technology from Gooch et al.
StyLit demo (Example-based stylization of 3D renderings) using technology from Fišer et al.