The brochure “Holographic Optical Trapping Software Packages” from Arryx Inc. describes the HOTapi software library, which enables programmers to add optical trapping capabilities to their applications without having to develop their own related algorithms and software. Downloadable from the company Web site, the eight-page document discusses end-user applications built on the HOTapi base. The HOTgui application integrates optical trapping with video to enable intuitive real-time operations, while the LabRyx is a high-level interface designed for power users. A chart compares software features. The packages are for use with the BioRyx 200 and HOTkit systems.