ConcatQuick concatenation of images and PDF files
Merge PDFs and image files without a scratch! Concat is an elegant productivity app for OS X. Simply drag and drop PDFs, JPGs, PNGs or TIFFs and Concat will automatically convert and combine them into a single PDF document.Get the app
Optics LabInteractive optical simulation
An interactive tool for students and educators. Learn about lenses, prisms and mirrors. Build optical devices from simple components.