Adobe Lightroom is available as part of Adobe Creative Cloud for as little as $9.99/month bundled with Photoshop CC as part of the photography package. Lightroom 6 is also available for purchase as a stand-alone app (with the cloud functionality removed) if you prefer.
Adobe Lightroom more...
- HDR images made easy - Create natural-looking or surreal images from extremely high-contrast scenes. Using HDR Merge, you can easily combine multiple shots taken with different exposure settings into a single high dynamic range image.
- Stunning panoramas - Capture superwide fields of view and amazing detail. Photomerge technology lets you more...
- OS X 10.8 or later