FJN Web Archive allows viewing of Safari WebArchive files.

Suspicious Package allows you to preview the contents of a standard Apple installer package without launching the Installer. You can click individual folder names to see their contents, or click the Show Contents button to see all content at once.

Displays machine embroidery files.

QuickLook plugin allowing previewing of a wide array of compressed file types. Currently supports: ZIP, TAR, GZip, BZip2, ARJ, LZH, ISO, CHM, CAB, CPIO, RAR, 7-Zip, DEB, RPM, StuffIt's SIT, DiskDoubler, BinHex, and MacBinary. Version 1.1 brings additional view options, collapsible folders, and many other features.

Preview Illustrator, InDesign, and EPS documents without launching an application. Also allows viewing of fonts, images, and colors used in many CS3 documents.