Did you ever enter a game of League and couldn't play because your ping was so high? You would try to cast that ultimate but the champion would react 2 seconds later... So annoying! And the worst part is, LoL doesn't provide you with ping knowledge before you enter a game. But this app does!
LoLPing is a simple menu bar application that informs you about what your current ping delay to the League of Legends® servers. You can pick the server you are playing on from the menu and how much lag would have if you entered a game right now. The delay is expressed in terms of milliseconds, the time it takes for a network packet to travel from your computer to the server and back.
LoLPing is open source: https://github.com/orkun1675/LoLPing