Solidity - Solidity docs - Solidity Browser - Cosmo (Doesn't really work)
Local node - Setting up private network - How To Create A Private Ethereum Chain
Ethereum OS/Wallet: https://status.im/
Tutorial for a contract example: https://ethereum.org/token#the-code
Meteor template: https://github.com/SilentCicero/meteor-dapp-boilerplate
http://www.ethereumoxford.org/tutorials/Tutorial3.html
The Wallet: https://github.com/ethereum/mist/releases
Plasma (possible solution to scalability problem): https://www.google.co.uk/amp/s/www.coindesk.com/ethereum-lightning-buterin-poon-unveil-plasma-scaling-plan/amp/