Glossary
Foundry
A Rust-based EVM development toolkit — Forge (testing), Cast (RPC), Anvil (local node), Chisel (REPL). Fast tests written in Solidity itself.
Foundry, by Paradigm, replaced Hardhat as the dominant EVM dev toolkit for many teams by ~2023. The standout property is that tests are written in Solidity, run by Forge directly against a local EVM in Rust — orders of magnitude faster than JavaScript test runners.
Cast is a Swiss-army RPC tool, Anvil is a local devnet, Chisel is a Solidity REPL. The toolkit's invariant-testing, fuzzing, and forking features are now table stakes for serious smart-contract testing.