iPulse is described as 'Monitor numerous OS X statistics including: CPU activity System load over time Network bandwidth and activity Memory activity and usage Battery & wireless signal strength Disk usage Current time and date ' and is an app in the System & Hardware category. There are more than 25 alternatives to iPulse for a variety of platforms, including Mac, Windows, Linux, PortableApps.com and BSD. The best alternative is Process Explorer, which is free. Other great apps like iPulse are Rainmeter (Free, Open Source), htop (Free, Open Source), Process Monitor (Free) and Glances (Free, Open Source).
Glances is a cross-platform monitoring tool which aims to present a large amount of monitoring information through a curses or Web based interface. The information dynamically adapts depending on the size of the user interface.
iStat is a series of system monitor apps. It's available in different versions: iStat Menus, iStat for iOS and iStat Server as a companion application to the iStat for iOS app that lets you remotely monitor your computers (free for Windows and Mac).
System Explorer is an enhanced Taskmanager that provides detailed information about running processes, startup programs, IE add-ons (BHOs), drivers, services network connections, system resources and more.