IncrediMail Ltd.

IncrediMail is a free, fun, powerful user-friendly email program that lets you add 1000’s of Email backgrounds, Emoticons, Ecards, Sounds, Animations, and 3D effects to your emails. You also get fun animated characters to notify you of new email.

HiYo is a free add-on for Windows Live Messenger, offering fun high-quality Winks, Animations, Emoticons and Sounds for your Instant Messages.