rest-api
(12)
Docmosis
A smart template-based approach to generating custom PDF and Word documents
Directus
Directus is an open-source data platform that wraps any SQL database with an instant REST and GraphQL API plus a no-code admin app, letting developers and non-technical users manage content and data without building a backend from scratch. Founded on a project Ben Haynes started in 2004 and incorporated as a company in 2020, Directus has surpassed 30 million downloads and is used by organizations including Adobe, Bose, Tripadvisor, AT&T and the U.S. Navy.
Lime Trading
Lime Trading (Lime Trading Corp., operating as Lime Financial) is a New York-based broker-dealer that gives independent and institutional traders access to institutional-grade trading technology. Born in 2000 inside a quantitative hedge fund as Lime Brokerage, the firm built low-latency infrastructure for high-frequency trading and now offers direct market access, trading APIs, colocation, and proprietary web and mobile platforms for trading U.S. equities, options, and futures. It positions itself in the gap between bulge-bracket banks and retail apps, serving sophisticated traders and developers who want speed, transparency, and quality execution.
Appeon
Appeon is a San Francisco software company that develops, sells, and supports PowerBuilder, the veteran rapid application development platform it took over from SAP in 2016. Through PowerBuilder, PowerServer, InfoMaker, and its CloudPro bundle, Appeon helps enterprises build data-driven business apps and modernize decades-old client/server systems into cloud-native and C#/.NET applications - protecting existing code investments rather than forcing full rewrites.
Appsmith
Appsmith is an open-source, low-code platform that lets developers quickly build internal tools - admin panels, dashboards, CRUD apps, and workflow automations - by dragging pre-built UI widgets onto a canvas and wiring them to databases and APIs with JavaScript. Founded in 2019 by Abhishek Nayak, Arpit Mohan, and Nikhil Nandagopal, the company positions itself as the developer-first, self-hostable alternative to closed platforms like Retool, and has expanded into AI-powered agents that give business teams context-aware automation on top of their own data.
Upstash
Upstash is a serverless data platform built for developers who deploy at the edge. Its flagship product is a Redis-compatible database that talks over HTTP instead of a persistent TCP connection, which makes it work inside serverless and edge runtimes where traditional Redis breaks. Around that core it has added QStash (a serverless message queue and scheduler), Upstash Vector (a serverless vector database), Search, and Workflow (durable serverless functions). Everything is priced per request with a guaranteed cap, so developers start free and pay only for what they use. Founded in 2020 by ex-Hazelcast engineers, Upstash powers Vercel KV under the hood and reached $1M ARR two years after its seed round.
Letta
Letta is a San Francisco AI research lab and platform for building stateful agents - AI that remembers, learns, and improves itself over time. Spun out of UC Berkeley's Sky Computing Lab from the viral MemGPT project, Letta gives developers an open framework, API, and cloud service where agent state (memories, messages, reasoning, tool calls) is persisted in a database rather than lost when it falls out of the context window. The company positions itself as the open alternative for developers who want to build agents that behave less like stateless chatbots and more like continuously learning digital collaborators.
Nutiliti
Nutiliti is a software-plus-service utility management platform that lets property managers and owners hand off the tedious work of turning utilities on and off, retrieving and paying bills, billing tenants back, and reconciling the accounting. Founded in 2020, the company pairs a REST API and dashboard with dedicated human account managers, aiming to collapse work that once took 80-plus hours a month into a couple of hours while protecting portfolio NOI. It serves single-family, multifamily, and commercial operators across the United States.
Nick Whalley
Nick Whalley is the co-founder and CEO of Nutiliti, a utility management platform that handles the unglamorous but expensive work of turning power, water, and gas on and off across rental portfolios. A Dartmouth-trained engineer who spent three years on Goldman Sachs's electronic trading desk before leaving in 2020 to build software for property managers, Whalley runs a company whose pitch is blunt: manage properties, not utilities. Nutiliti automates activations, deactivations, bill payment, and accounting reconciliation, and exposes it all through a REST API so single-family rental and build-to-rent operators can stop drowning in utility paperwork.
EasyPost
EasyPost is a Utah-based logistics technology company that built the first RESTful shipping API, giving developers a single integration point to rate-shop, buy and print labels, verify addresses, track packages and insure shipments across 100+ carriers worldwide. Founded in 2012 by Jarrett Streebin, it removes the technical complexity of shipping so e-commerce brands, marketplaces and fulfillment providers can ship like Amazon without rebuilding carrier plumbing from scratch.
Verbwire
Verbwire was a Web3 infrastructure company that collapsed the entire smart-contract stack into a single REST API. Founded by two former Wall Street quants, it let developers in any language - Python, Java, JavaScript, C++ - deploy contracts, mint NFTs, manage wallets, store files on IPFS and query on-chain data without ever touching Solidity or Hardhat. With 60+ endpoints across 10+ EVM blockchains, it served tens of thousands of developers and processed millions of API calls before the founders wound it down, noting that AI had begun to close the very complexity gap they were built to bridge.
Contentful
Contentful is an API-first, cloud-native content platform - the company that popularized the 'headless CMS.' Founded in Berlin in 2013, it separates content from presentation so teams can store structured content once and deliver it anywhere: websites, mobile apps, kiosks, smart watches, or AI agents. It serves more than 4,800 brands, including roughly 30% of the Fortune 500, and in June 2026 entered an agreement to be acquired by Salesforce to power the content layer behind Agentforce.