iStat - System Activity Monitor.

iOS app providing you all information about your device - hardware, operating system, processor, memory, GPU, network interface, storage and battery, including OpenGL powered visual representation in real time.

Hardware information:
-iDevice name
-Screen resolution
-Screen size
-Retina capability
-Pixel density
-Aspect ratio

Operating System:
-Version
-Build
-Revision
-Kernel information
-Safe Boot
-Boot time
-Uptime
-Tick frequency
-Operating system limits: processes, files, VNodes

CPU:
-Name
-Architecture
-Physical and logical core count
-Frequency
-L1, L2 cache size
-Endianess

RAM:
-Total memory
-Memory type
-Memory usage: wired, active, inactive, free
-Page-ins
-Page-outs
-Page-faults

GPU:
-Chip name
-Supported OpenGL version
-OpenGL vendor
-Supported OpenGL extensions

Network:
-External IP
-Internal IP
-Netmask
-Broadcast IP
-Total WiFi and cellular traffic since boot.

Connections:
-List active connections
-Connection local and remote IP
-Connection local and remote port
-Connection status
-Connection download and upload traffic

Storage:
-Total available space on device
-Free space
-Used space
-Number of songs
-Number of pictures and total size on disk
-Number of videos and total size on disk

Battery:
-Battery capacity
-Battery voltage
-Battery status
-Current battery level