Manga Loader NSFWJS
Loads manga chapter into one page in a long strip format, supports switching chapters and works for a variety of sites, minimal script with no dependencies, easy to implement new sites, loads quickly and works on mobile devices through bookmarklet
Can work on almost any webcomic/manga page, preloads 5 or more pages ahead (or behind), navigates via ajax for instant-page-change, lets you use the keyboard, remembers your progress, and it's relatively easy to add new sites
Hentai Heroes image viewerJS
Allows you to display any stage image of any harem girl, owned ones or not. Works also in event display and Places of Power. Includes zoom-in feature to display full-size girl images gallery (lightbox).