Hardware & software:
- GetMacApps at http://getmacapps.com for free from Leo Laporte.
- Slugline – Act Focused Media LLC (App Store) for $39.99 from Alex Lindsay.
- CameraSize.com at http://camerasize.com for free from Andy Ihnatko.
- Wolfram Language at http://www.wolfram.com for free from Rene Ritchie.