iStat Menus

Some features:
CPU - Monitor cpu usage. 7 display modes, multiple core support.
Memory - Monitor memory usage. 4 display modes, page ins/outs and swap usage display.
Disks - Monitor disk usage and activity. 6 display modes, ability to hide disks you dont want to see.
Network - Monitor current and total bandwidth, peak bandwidth, ip addresses, and the ability to hide network connections you don't want to see.
Temps - Monitor the temperature of your mac. 2 display modes, ability to hide sensors you dont want to see.
Fans - Monitor the fan speeds in your mac. 2 display modes, ability to hide sensors you dont want to see.
Bluetooth - Control bluetooth status plus monitor the battery level of your Apple wireless keyboard or mouse.
Date & Time - Date + time in your menubar. World clock display lets you see the time in multiple locations around the world.

Whats new:
Improved OS X Mountain Lion support, including Gatekeeper.
Fixed some minor bugs.
Added ability to send diagnostic and usage data.

What's New Version 3.2.5:
- Important bug fixes.
- Replaced open iCal with open Calendar for Mountain Lion users.
- Improved support for Mountain Lion.
- Improved process monitoring.
- Improved update checker.

What's New Version 3.2.6:
- Fixed bug where SMART drive temperature might be missing initially.
- Fixed performance issues caused by the previous update.

What's New Version 4.02
Added dark dropdown theme.
Added white menubar theme (for those with a dark Mac menubar).
Added more customisation options in Disks extra.
Moved disk activity into main drop down in Disks extra.
Improved download & upload order to be more consistent.
Fixed some installation issues.
Fixed several calendar issues.
Fixed world clocks being in the wrong order in some cases.
Fixed an issue that caused the menubar time to stop updating

4.03
Fixed an issue where items wouldn’t update.
Improved download & upload order to be more consistent in the Combined item.
Improved selected state for menubar icons.
Improved some menubar icons.
Fixed an issue where where the world clocks list didn’t display correctly.
Fixed an issue with processes not displaying.

What's New: Version 4.04:
- Fixed issue with the wrong GPU being shown as active.
- Fixed issue with calendar incorrectly showing some days as being in the next month.
- Fixed issue with VPN connections causing incorrect bandwidth reading in the menubar.
- Fixed several issues with fan control settings not being applied in some conditions.
- Fixed menubar layout issue with used/free mode in Disks.
- Fixed layout issue with CPU history graphs in menubar in some situations.
- Fixed issue in Time where the hour could be displayed wrong with some configurations.
- Fixed issue with A/P display in world clocks.
- Fixed issue with corrupt history databases.
- Reduced disk write frequency of history databases.

Version 4.05:

- Added CPU Core temperature sensors and CPU power sensors for some Sandy/Ivy Bridge based systems.
- Improved performance.
- Improved support for Cisco VPN connections.
- Fixed incorrect connection state problems with VPN connections.
- Fixed an issue where invalid/unsupported temperature sensors were being shown on some Macs.
- Fixed menubar time format problem if multiple hour tokens were used.
- Fixed issue that could lead to incorrect disk names being shown in disk activity.
- Fixed a display issue where upload and download graph colours were back to front in the Stacked mode in the Network menu.