New features in GIMP 3 include non-destructive filters, improved text editing, and simpler layer management. Working with filters, layers, and text is much easier in this latest release.

QuickImageComment is a free photo details finder & image metadata viewer, editor to view & edit image EXIF, IPTC, XMP metadata for JPEG, TIFF & other formats.

For image editing, Sumo Paint offers many Photoshop standbys. And best of all, this Web-based application is free.