checking host hardware using linux kernel

How to collect information about  host without trivial system command

  I'm using a lot of hardware boxes with no limit on distro types and versions.  In this case using system command such as ifconfig has a limited usage.  Also,  system config files have a different path and best way for me is getting information from the kernel. Of course,  I'm using cat command for doing this.
Next table has information about hardware. Let me know if something is interesting for you and you know something interesting

hardware information in the linux kernel

file path	information
/proc/cpuinfo	CPU
/proc/meminfo	memory
/sys/block	List of block devices. HDD has sd or hd at the beginning
/sys/class/block/{digit}/device/model	HDD drive and vendor
/sys/block/{digit}/size	HDD size
/sys/block	List of block devices. HDD has sd or hd at the beginning
/sys/bus/pci/devices/0000:{digit}/net	System name of the network card
/sys/devices/virtual/dmi/id/board_*	Motherboard information
/proc/net/route	Netcard names with VLAN datas, network and netmask
/proc/net/fib_trie	route caching (also has information about local IPs)
/proc/version	kernel version and uptime

Simple bonus

I've written a simple python script for  checking all information at remote host via SSH connection. you need ssh key  for connection only.  Link is here: python code is here.