Apps with 'Memory usage' feature

Android is an operating system for mobile devices such as smartphones and tablet computers.

Memtest86+ is a free-to-download memory test software designed to test and stress test an x86 or x64 architecture computer's random access memory (RAM) for errors.

TrafficMonitor is a network monitoring suspension window software in Windows. It can display the current network speed, CPU and memory usage. It also support the functions of display in the taskbar, change skin and historical traffic statistics.

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).

PrimoCache is a supplementary software caching scheme that cooperates with system memory to provide data caching for disks. It improves system performance by transparently storing data into memory such that future requests for that data can be served faster.

The missing desktop for the cloud.

Resource monitor that shows usage and stats for processor, memory, disks, network and processes.

Auto Tab Discard a lightweight extension that uses the native method (tabs.discard) to unload or suspend browser tabs to significantly reduce the memory footprint of your browser when many tabs are opened.

Hardinfo is a system information and benchmark tool for Linux. It shows detailed system info, including hardware, environment, and kernel. It can use lm_sensors and ACPI for temperature and battery information. It also has four CPU banchmarks and two FPU benchmarks.

Yet another cross-platform graphical process/system monitor.

TechPowerUp Memtest64 is a lightweight, standalone utility that lets you check your system memory for problems at the hardware-level. It has a graphical interface, and can be run from within Windows.

Lets you keep your eye on system resource usages of your PC. It supports 43 kinds of information including CPU, Memory, Network, and detailed HDD usages, so you may discover what's limiting your system performance in each occasion.

Firemin is a small utility to reduce the amount of memory Firefox or other browsers use. Although Firefox memory usage improved a little over the last few years, it still uses a lot of memory; a little more than we feel comfortable with.

Mac OS X System Monitor and Process Explorer Tool.

This compact utility displays real-time CPU, RAM and disk drives usage meters right on the taskbar notification area, or next to the system clock, that is always visible.