Scroll Reverser is a free app for Mac OS X that reverses the direction of scrolling. You can use it with OS X Leopard and Snow Leopard to make your scrolling match the 'natural scrolling' in Lion.
You can also use it with OS X Lion to customise scrolling behaviour beyond what is possible in system preferences, for example to reverse the trackpad but not the mouse.
Download Scroll Reverser (v1.4.4, released September 29, 2011; Universal binary)
To install, unzip and copy it to your Applications folder. To uninstall, drag it to the trash. Requires Mac OS X 10.5 or above. Languages: English, Brazilian Portuguese, Greek, Italian, Spanish, French, Romanian.
Does it reverse 3-finger swipes too? No, it only reverses scrolling. The other gestures are a lot more complicated, and I won't be able to add support for them.
It's reversing my trackpad scrolling, but I told it not to. If you have an older Mac without a multi-touch trackpad then Scroll Reverser will see your trackpad as a mouse.
The three finger tap gesture in Lion that does a dictionary lookup no longer functions when Scroll Reverser is active. Yep, sorry. I know about this. I haven't worked out a fix yet.
I want to reverse scrolling on my Windows machines too. AutoHotKey (free, open source) has the ability to reverse scrolling on Windows, and here's a guide to configuring it.
Scroll Reverser was made by Nick Moore and you are free to use, copy and share it. To get in touch please contact support@pilotmoon.com or tweet @pilotmoon. Please also check out my other apps!
© 2012 Pilotmoon Software