Rapidmg

Rapidmg lets you extract DMG files without the need to mount them.

– App Detection: detects the app in DMG files and offers to copy it directly to your Applications folder.
– Faster Extraction: DMG extraction is faster than copying files from mounted volumes. Plus, no more waiting for mounts or unmounts.
– Optional Cleanup: You can choose whether you want to keep or delete the original DMG file after extraction.