Monosnap - Monosnap is a comprehensive screenshot taking software system that provides users with a fast and accessible way to take screenshots whenever they want. Read more about Monosnap.
Xnapper - Take beautiful screenshots instantly
Annotate - Annotate (formerly know as Glui) is the simplest way to capture, annotate and share screenshots.
Screenzy - A simple screenshot beautifier
LabelMe Annotation Tool - LabelMe is an annotation tool writen in Javascript and Perl for online image labeling.
BrandBird - Brand your Twitter content uniquely