Mnemonic Code Converter

You can enter an existing BIP39 mnemonic, or generate a new random one. Typing your own twelve words will probably not work how you expect, since the words require a particular structure (the last word is a checksum).

For more info see theBIP39 spec.

https://iancoleman.io/bip39/#

INFURA

Test Ethereum Network (Rinkeby)

https://rinkeby.infura.io/RtcHsbnblvLKSTE0QsTe

Rinkeby Authenticated Faucet

This Ether faucet is running on the Rinkeby network. To prevent malicious actors from exhausting all available funds or accumulating enough Ether to mount long running spam attacks, requests are tied to common 3rd party social network accounts. Anyone having a Twitter, Google+ or Facebook account may request funds within the permitted limits.

https://faucet.rinkeby.io/

Etherscan

Etherscan reads all transactions that flow into the networok.

https://rinkeby.etherscan.io/

Remix online editor

http://remix.ethereum.org/