Free, cross-platform desktop app (JavaFX, self-contained with a bundled JRE since v4) for splitting, merging, mixing, rotating, and extracting pages from PDF files through a simple drag-and-drop GUI. Built around PDFBox and other open-source PDF libraries under the hood, packaging their capabilities into point-and-click tools rather than requiring command-line usage. A free, basic-operations counterpart to PDFsam's own commercial 'Enhanced' edition, which adds more advanced features.