Database

Upstash QStash: serverless message queue, HTTP-based, scheduled messages, retries, callbacks, topics, DLQ

ConfigCat: feature flags and remote config with percentage rollouts, targeting rules, config-as-code, and cross-platform SDKs

Flagsmith: open-source feature flags, remote config, segments, environments, audit logs, self-hosted, REST API

Flipt: open-source, self-hosted feature flag platform with GitOps support, boolean and multivariate flags, and GRPC/REST APIs

GrowthBook: open-source feature flags, A/B testing, Bayesian statistics, SDK, targeting, webhooks, self-hosted

LaunchDarkly: feature flags, targeting rules, segments, experiments, metrics, Node/React SDK, bootstrap, streaming

Split.io: feature delivery platform with feature flags, targeting, experimentation, traffic allocation, and metrics integration

Statsig: feature gates, dynamic config, experiments/A/B tests, metrics, layers, Next.js SDK, server/client evaluation

Unleash: open-source feature flag management with activation strategies, variants, constraints, self-hosted or managed

Acuity Scheduling API integration for appointment booking, availability management, and calendar sync

Cal.com: open-source scheduling, booking API, event types, availability, webhooks, embeds, self-hosted

Calendly API: scheduling links, event types, invitees, webhooks, organization management, OAuth, REST API

Cronofy: calendar API, availability, scheduling, real-time sync, conferencing, UI elements, enterprise calendar integration

Doodle API integration for group scheduling polls, 1:1 booking pages, and meeting coordination

Microsoft Bookings integration via Microsoft Graph API for enterprise appointment scheduling and calendar management

Nylas: unified calendar/email/contacts API, scheduling, calendar CRUD, email send/read, OAuth providers, Node SDK

SavvyCal API integration for personalized scheduling links, availability overlays, and calendar coordination

Adobe Firefly: text-to-image generation, generative fill, generative expand, style reference, content credentials, REST API

Cloudinary: image and video upload, transformation, AI-based generation, background removal, CDN delivery, URL-based API

DALL-E API (OpenAI): image generation, editing, variations, quality/style params, size options, Node SDK

fal.ai: fast inference, Flux, realtime image gen, queue API, webhooks, JavaScript SDK, serverless GPU

Imgix: real-time image processing and CDN, URL-based transformations, resizing, cropping, watermarking, face detection, format optimization

Leonardo AI: image generation API, fine-tuned models, canvas editing, texture generation, REST API

Replicate for image generation: Flux, SDXL, img2img, inpainting, upscaling, predictions API, webhooks, streaming

Stability AI: Stable Diffusion API, text-to-image, image-to-image, inpainting, upscaling, SDXL, REST API

DocRaptor: HTML-to-PDF API, Prince XML engine, CSS print styles, headers/footers, page breaks, async documents

Docusaurus: React-based static site generator for documentation sites, versioned docs, MDX support, search integration, i18n

jsPDF: client-side and server-side PDF generation in JavaScript, tables, images, custom fonts, autotable plugin

LaTeX with Node.js: compile LaTeX documents programmatically, template-based PDF generation, mathematical typesetting, academic papers

Markdoc: Stripe's Markdown-based authoring framework for structured documentation, custom tags, validation, and renderers

pdf-lib: create and modify PDFs in JavaScript, form filling, page manipulation, embedding images/fonts, digital signatures

Puppeteer: headless Chrome, PDF generation from HTML, screenshots, web scraping, page automation, Chromium control

React-PDF (@react-pdf/renderer): PDF generation with React components, styled documents, dynamic content, tables, images, fonts

Crowdin: translation management, OTA content delivery, API, CLI, GitHub integration, in-context editing, glossaries

i18next: internationalization framework, React (react-i18next), namespaces, interpolation, plurals, backends, language detection

Lokalise: translation management, API, SDKs, OTA updates, branching, screenshots, plural forms, CLI

next-intl: Next.js internationalization, message catalogs, routing, middleware, server components, formatters, pluralization

Phrase (formerly PhraseApp): translation management, API, CLI, OTA, in-context editor, branching, webhooks, glossaries

Mozilla Pontoon: open-source translation management, Fluent/FTL support, in-place editing, community localization, VCS sync

Transifex: translation management, Native SDK, OTA delivery, API v3, CLI, GitHub/GitLab integration, ICU plurals

Weblate: open-source translation management, VCS integration, automatic suggestions, quality checks, API, glossary, translation memory

Ark UI: state machine-driven components, headless primitives, Select, Combobox, DatePicker, Toast, styling with any CSS framework

daisyUI: Tailwind CSS component library, themes, responsive utilities, component classes, customization, semantic color names

Headless UI: unstyled accessible components for Tailwind, Dialog, Combobox, Listbox, Menu, Transition, render props, React/Vue

Kobalte: accessible, unstyled UI component library for SolidJS with WAI-ARIA compliance and composable compound component APIs

Melt UI: headless, accessible UI component builders for Svelte using the builder pattern with full styling freedom

Park UI: pre-designed styled components built on Ark UI primitives, available for React, Vue, and Solid with Panda CSS or Tailwind CSS styling

Radix UI: accessible primitives, Dialog, Dropdown, Popover, Tabs, Toast, composition pattern, styling with className, controlled/uncontrolled

shadcn/ui: copy-paste components, CLI installation, theming with CSS variables, dark mode, component customization, form integration, data tables, command palette

CSS Modules: scoped CSS, composition, global styles, Next.js integration, TypeScript declarations, naming conventions

Lightning CSS: ultra-fast CSS transformer, bundler, and minifier written in Rust, with modern syntax lowering, vendor prefixing, and CSS modules

Panda CSS: build-time CSS-in-JS, atomic CSS, recipes, patterns, tokens, conditions, RSC compatible, type-safe styles

Stitches: near-zero runtime CSS-in-JS, variants API, theme tokens, responsive styles, SSR support, polymorphic components

styled-components: CSS-in-JS, tagged template literals, theming, dynamic styles, SSR, global styles, extending

Tailwind CSS: utility-first CSS, responsive design, dark mode, custom theme, plugins, @apply, JIT, content configuration, arbitrary values

UnoCSS: instant on-demand atomic CSS engine, presets, shortcuts, rules, variants, attributify mode, icon support, inspector

vanilla-extract: zero-runtime CSS-in-TypeScript, sprinkles (utility classes), recipes (variants), themes, type-safe styles

Jotai atomic state for React — primitive/derived/async atoms, Provider-less mode, atomWithStorage, atomWithQuery, and React Suspense integration

Legend-State high-performance observable state for React — fine-grained reactivity, persistence plugins, computed observables, and sync engine

Nanostores tiny framework-agnostic state manager — atoms, computed stores, lifecycle events, and integrations with React, Vue, Svelte, and vanilla JS