WebEx Recording Editor (formerly called WebEx Recorder and Player) is a little-known but extremely excellent commercial-grade, high-quality free screen action recording tool. It can record full-screen or specified window, allows to set whether to contain the sound or not. In particular, the size of recording file generated by WebEx Recording Editor is almost the smallest with unexpectedly clear and smooth playing effect (basically lossless). Moreover, the whole recording process only takes up very little system resource.
MarkMan (马克鳗) is a handy, very fast, smart and efficient labeling/marking app from China. It's a must-have design annotator for designers, reconstructors, front-end engineers on Windows, Mac OS X and Linux.
Screenmarker is a simple, compact, portable and free screen annotation tool, its biggest characteristic is that it enables to change betweent annotation and mouse operations, and no loss of contents.