add ethgastracker

Author: wslyvh

public/content/developers/docs/gas/index.md

@@ -124,6 +124,7 @@ Layer 2 scaling is a primary initiative to greatly improve gas costs, user exper
 If you want to monitor gas prices, so you can send your ETH for less, you can use many different tools such as:
 
 - [Etherscan](https://etherscan.io/gastracker) _Transaction gas price estimator_
+- [ETH Gas Tracker](https://www.ethgastracker.com/) _Monitor and track the Ethereum, and L2 gas prices to reduce transaction fees and save money_
 - [Blocknative ETH Gas Estimator](https://chrome.google.com/webstore/detail/blocknative-eth-gas-estim/ablbagjepecncofimgjmdpnhnfjiecfm) _Gas estimating Chrome extension supporting both Type 0 legacy transactions and Type 2 EIP-1559 transactions._
 - [Cryptoneur Gas Fees Calculator](https://www.cryptoneur.xyz/gas-fees-calculator) _Calculate gas fees in your local currency for different transaction types on Mainnet, Arbitrum, and Polygon._