Leveled structured logging for Standard ML (MLton + Poly/ML): logfmt + JSON renderers, withFields child loggers, tee/filter sinks, parseLevel/setLevel, and a deterministic capturing sink. Pure.

Umbrella of the pure-SML web stack: one request->response app wiring router + middleware + sessions + negotiation. Pure, deterministic, dual-compiler.

RFC 3986 URI + x-www-form-urlencoded for Standard ML: percent codec, parse/toString, reference resolution, query handling, CLI. Pure, dual-compiler.

Virtual DOM in pure Standard ML: diff two sml-html trees into a minimal patch list with a round-tripping apply oracle. Dual-compiler (MLton + Poly/ML), byte-identical, deterministic.

Principal Component Analysis in pure Standard ML via Jacobi eigen-decomposition: components, explained variance, transform. MLton + Poly/ML.

Okapi BM25 / TF-IDF document ranking in pure Standard ML, built on an inverted index. Deterministic, MLton + Poly/ML.

Unified AEAD facade (ChaCha20-Poly1305 + AES-128/256-GCM) in pure Standard ML, with byte-exact RFC 8439 / NIST GCM vectors. Dual-compiler (MLton + Poly/ML).

Pure Standard ML special functions: gamma, beta, erf, incomplete gamma/beta (MLton + Poly/ML, deterministic).

Pure Standard ML JSONPath query engine over sml-json (MLton + Poly/ML)

HTML AST with safe-by-default, context-aware escaping for Standard ML. XSS holes are opt-in and greppable. Pure, dual-compiler (MLton + Poly/ML).

Pure Standard ML number theory: sieve, factorization, CRT, totient, Jacobi (MLton + Poly/ML)

Pure Standard ML animated GIF encoder (LZW + median-cut palette) (MLton + Poly/ML)

SWIM-style gossip membership & failure detection simulated as a pure deterministic state machine in Standard ML (seeded PRNG). MLton + Poly/ML.

Combinatorial enumeration and exact counting in pure Standard ML: permutations, combinations, partitions, Gray codes, Catalan/Stirling numbers (IntInf). MLton + Poly/ML.

Pure Standard ML Git plumbing: object, packfile, index and ref formats (MLton + Poly/ML, deterministic).

Pure Standard ML RSA: keygen, PKCS#1 v1.5 / OAEP / PSS, DER/PEM keys (MLton + Poly/ML)

MCMC samplers in pure Standard ML: Metropolis-Hastings and Gibbs with seeded PRNG (no ambient randomness). Deterministic, MLton + Poly/ML.

Consistent hashing ring with virtual nodes in pure Standard ML (CRC32-based). Minimal remapping on membership change. MLton + Poly/ML.

Impure minifb desktop-window backend for the pure sml-ui toolkit: opens a real OS window and runs the live interactive widget demo (MLton FFI, macOS). Quarantined impure tool.

Decode form/query/JSON bodies into typed values for Standard ML via a validation applicative that accumulates errors. Pure, dual-compiler.