SynthChord
Music Synthesizer App
Chord-pad synthesizer built on the Nashville Number System — tap diatonic pads or twist a joystick to morph chord quality (maj7, sus4, dim, aug), with Roman numerals and absolute names side by side. Multi-backend audio (dart_melty_soundfont + flutter_pcm_sound PCM loop on mobile/macOS, FluidSynth fallback on desktop/web), three instrument engines (SF2 soundfont, pure-Dart subtractive synth, chromatic WAV sampler), a reorderable effects chain (Freeverb/delay/filter), looper, and arpeggiator. EN/ES/FR/pt-BR UI with a RevenueCat IAP freemium gate; targets Windows, Android, iOS, Web.
FlutterDartRiverpodFluidSynthSoundFontRevenueCat
protoglot
Multiprotocol API Client
Local-first, git-friendly API client spanning REST/GraphQL/SOAP/WebSocket/gRPC in a single TOML collection format — a Postman/Bruno alternative published to npm + crates.io. Dynamic gRPC via .proto reflection (no protoc), a CLI-first (pglot) test runner with JUnit/TAP output and CI-correct exit codes, data-driven testing (CSV/JSON) with JSON Schema + snapshot assertions, and JS pre/post-request hooks via boa_engine. A native egui desktop app shares the same engine; Cargo workspace with dual npm + crates.io distribution and SLSA build provenance.
Rusteguitonic (gRPC)boa_enginecrates.io
claude-skills
Claude Code Plugin Marketplace
Curated marketplace of 13 Claude Code skills, each a standalone plugin installable in one line via /plugin marketplace add mqmalagris/claude-skills. Five compose into a single feature-delivery pipeline (grill-me → to-prd → compass → heist → maestro) that takes a feature from vague idea to merged code, each stage consuming the prior artifact and routing back if context is thin. The rest cover language idioms (code-craft: 7 languages, 12 frameworks), deterministic LLM-first SEO audits, OWASP WSTG security testing, and career/content tooling — all built on a progressive-disclosure layout (SKILL.md router loading workflows/topics/reference on demand).
Claude CodeMarkdownJSON manifestsMIT
yield-curves
Rust Yield Curve Library
Pure-Rust library for fixed-income yield curve interpolation, parametric fitting, and bond pricing, published to crates.io with zero third-party numerical crates. Five interpolation methods (piecewise linear, C² cubic spline via Thomas solver, Fritsch-Carlson PCHIP, Nelson-Siegel, Svensson) plus an in-tree Nelder-Mead optimizer, a compounding/forward-rates module (continuous, periodic incl. Brazil-252, simple), bond analytics (Macaulay/modified duration, convexity, par yield off any interpolator), and a zero-dependency date toolkit (ISDA 2006 day counts, BUS/252 ANBIMA calendar, coupon-schedule generation). unsafe_code = "forbid" crate-wide, with SLSA Level 3 build provenance attested per tagged release.
RustPCHIPNelder-MeadSvenssoncrates.io
CalculeOnline
Brazilian Calculator Platform
PT-BR calculator platform with 140+ static pages across Brazilian tax/payroll, real estate, math, and finance — including a symbolic calculus parser (derivatives/integrals/limits) and 2D/3D function plotters. Astro SSG with Svelte 5 islands; a build-time hook pulls live Selic/CDI/IPCA rates from my own Indicadores-BR API, with a cached snapshot as fallback.
AstroSvelte 5Tailwind v4Chart.jsBun
Ephemask
Disposable Email Service
Serverless temp email service with dual frontends in a Turborepo monorepo. Go Lambda functions, Terraform-managed AWS infra, freemium model (10-min free / 60-min pro).
GoAWS LambdaTerraformAstroSvelte 5React Native
Baby Shower
Baby Shower Event Platform
Public-first event site — no accounts, RLS enforces all access. RSVP with guest counts, gift registry (33 items, 5 categories, DB-level RLS prevents double-reservations), moderated message board, and admin dashboard behind a server-side password gate (Astro SSR).
AstroSvelte 4SupabaseTailwindVercel