4byte

Semgrep is a pattern-based static analysis tool with rulesets for Solidity vulnerabilities. Builders run those rules over a codebase to catch known vulnerable patterns and style issues before review.

heimdall-rs is a Rust EVM toolkit that disassembles bytecode, decompiles contracts, generates control flow graphs, and decodes calldata and traces. Builders reach for it when they need to understand a contract that has no published source.

sol2uml generates UML class and storage-layout diagrams from Solidity source or from verified contracts. Builders run it to see contract relationships and how state variables are packed into storage.