Applies important security fixes throughout Mac OS X 10.5 Leopard. (Free, download sizes vary.)

Adds support for Rapportive and for the iWork '09 applications' Send via Mail menu items, and fixes a few minor bugs. ($24.95 new, free update, 6.7 MB)

Improves stability and fixes problems through the application. ($199 new, free update, 69.83 MB)

Fixes a crashing problem caused by generating thumbnails of movies from the Aperture 3 library. (Free update, 35.84 MB)

Improves accuracy, enhances integration with Apple Mail in a number of ways, fixes several crashing bugs, and clarifies documentation. ($30, free update, 6.4 MB)

Goes Intel-native; adds automatic crash recovery and easy revert-to-saved, along with heavily revamped user interface. ($299, $139.95 upgrade, 51.6 MB)

Addresses a critical security vulnerability, several other minor security threats, and unspecified stability issues. (Free, 19 MB)

Fixes cosmetic bugs, bugs related to syncing with Google Calendar, and no longer removes attachments and to-dos from WebDAV calendars. ($49, free updates, 5.6 MB)

Adds support for Growl, fixes private caller ID info numbers, and improves several features of the Call Window. ($20, free update, 2.7 MB)

Improves support for graphics-intensive applications, large virtual machines, USB connections, and Boot Camp. (Free public beta)

Adds a new Mixed Projects feature, addresses two minor bugs, and makes several localization improvements. ($49.95, free upgrade, 8.7 MB)

Improves overall stability, enhances support for 32-bit Audio Unit Bridge plug-ins, and fixes a long list of minor bugs and issues. (Free, 207 MB)

Brings previously unavailable Pro features to the Mac such as file sharing and transfer, folder synchronization, remote-to-local printing, and desktop sharing. ($69.95 per year, multi-computer discounts available)

Improves performance for Top Sites and stability for third party plug-ins and sites with forms and SVG images, as well as fixing a problem with some Linksys routers. A host of security fixes are rolled in, too. (Free, sizes vary)

Simplifies snippet creation and editing, can prompt the user for variable data while expanding snippets, offers snippet syncing via Dropbox, and provides new search options. ($34.95 new, $15 upgrades, free for those who purchased after 1 November 2009, 4.5 MB)