The OpenWrt/LEDE distributions provide several thousand packages to extend the functionality of your device.
The browseable package lists in this wiki will always show packages available in the current latest LEDE 17.01 update.
A quick overview to all available packages, sorted by type, can be seen in the Package Index.
A more comprehensive verbose package table can be found at Package Table.
Information that is no longer relevant to the current stable or snapshot version of OpenWrt can be found at Packages Information Archive