Trail of Bits Toolbox
One of the most well-established and respected audit firm's very own toolbox for ensuring high security standards.
H/T Matt Solomon. Check out his article for more.
A clear and concise checklist any serious devevloper or audit needs for their work. Written by our own Rajeev Gopalakrishna.
Detecting Not So Smart Contracts
Two useful repos for understanding the vulnerable patterns used by not-so-smart contracts, and for detecting various potential vulnerabilities.
Another useful Consensys tool that's easy to integrate with frameworks like Truffle especially.
An introduction to mutation testing from Security Track mentor Joran Honig. You can find a more detailed explanation of this technique here.
Smashing Smart Contracts for Fun and Profit
The original paper by Bernhard on profitting from fun and the security anlysis tool Mythril.
VS Code Solidity Auditor
A convenient and useful VS Code plugin to audit your smart contracts as you work.
The best blog to see how not to write smart contracts and learn about all the different ways your code could fall over in production.
The latest in blockchain and cryptocurrency threat intelligence, vulnerabilities, security tools, and events.
SecBit Token Libs
A useful set of token libraries, with proofs!
The dark web of DeFi journalism.
You can find a more complete, less organised list of other available resources here.