FFView is a fast OpenGL-powered picture viewer a la ACDsee. It is aimed at letting you read manga or other comics onscreen (in either windowed or fullscreen mode). Its features include fast prefetching, smooth panning, voice commands, the ability to browse pictures inside archives (.rar/.cbr, .zip/.cbz) and persistent per-picture options.
Yafca (Yafca's Another Flash Card Application) is an application for creating and viewing flash cards in an arbitrarily complex hierarchy of decks. It has built-in pinyin Unicode conversion and convenient font resizing, which makes it ideal for learning Chinese or other Asian characters.
Avenir is a new kind of software for writers. It is part word processor, part database, snd completely focused on the creative process. Whether you are brainstorming for your first short story or putting the finishing touches on your latest best-seller, Avenir provides you the tools you need to manage the creative process from inception to publication.