Companies
A library of community curated teaching and learning materials, free to the entire world. Come collaborate; we can teach better together. OpenCurriculum, Inc. is a California based technology nonprofit organization with a mission to bring openness and innovation to K12 education around the world
OpenFoundry is an open source platform that helps engineers build, deploy, and scale their open source AI stack 10x faster. Ship your AI stack with just one line of code. You could think of us as an open source alternative to Hugging Face. Learn more and check out a demo of this in action in our Launch YC post: https://www.ycombinator.com/launches/KhY-openfoundry-developer-infrastructure-for-open-source-ai
OpenFunnel is the Search Engine for GTM. Searching for "B2B SaaS, 501-1000 employees, uses Salesforce" - is just targeted spam. Even if you get creative with LLMs to query these databases, everyone has access to the same commoditized databases, these databases lack insights about right timing or pain-points prospects face. OpenFunnel is a time-aware search engine for insights and activities in your target segment - that reveal pain. You can search for activities like: "Find companies looking to implement usage based billing" "Find companies that moved from OpenAI to self-hosted models in the last 3-6 months" "Find companies who updated their pricing page to introduce an enterprise plan in the last 3 months" OpenFunnel continuously monitors these time-based signals, delivering actionable insights daily - so you have the fastest, unique insights that your competitors miss out on. Over 1000+ users are already discovering prospects through pain-first search, including some of the fastest-growing companies like Central, Mintlify, and Everest Systems.
OpenInvest is the first technology-backed, socially responsible investment asset management platform that aligns your investments with your values. OpenInvest’s proprietary technology seamlessly creates low-cost investment portfolios tailored to your values, while tracking market indices. A mission-driven company, OpenInvest was one of the first VC-backed Public Benefit Corporations.
OpenMeter's mission is to standardize metering with the goal of becoming the data source for AI and API monetization. We've built an open-source platform that processes billions of events into our usage lake in a matter of seconds, which acts as the backbone that serves revenue and efficiency teams.
OpenPhone is the modern business phone system. It comes with powerful calling, messaging, and a lightweight CRM. Works great for individuals and teams. It allows you to share a phone number with teammates, like an inbox. Available on Mac, Windows, Web, iOS, and Android.
OpenPipe is an SDK that abstracts away fine-tuning custom models. We capture your existing provider’s prompt-completion pairs in the background and use them to create a new model that is faster, cheaper and often more accurate than the original.
OpenSea is your home for trading everything onchain. Founded in 2017, OpenSea pioneered the first non-custodial marketplace for digital assets and has evolved into the destination for the entire onchain economy. Trade tokens, culture, ideas, digital assets, and physical assets across all major blockchains.
OpenSesame is building the fastest path for software companies to become entirely AI-native, turning any product’s existing APIs into a dedicated customer-facing AI agent. For decades, software interfaces have remained essentially unchanged; they are one-size-fits-all, failing to address the unique needs of each user. Today, legacy, more established software companies are facing pressure from their boards, investors, customers, and the media to incorporate AI into their products. However, long implementation timelines, rising AI talent costs, and outdated infrastructure are hindering their ability to reinvent themselves for the AI age. OpenSesame solves this by providing companies with an AI-native interface that they can embed within their existing software products, enabling their end customers to perform all their work using natural language across the entire product offering.
OpenSight helps companies quickly scale up their support function and resolve customers' questions much faster. With the latest advancement in LLMs, OpenSight offers accurate answers and action resolution paths resolving >70% of inbound customer inquiries.
OpenUnit is the all-in-one platform self-storage facilities need to run their business - whether they’re a single mom-and-pop site or a multi-facility corporation. Our complete set of tools gives storage operators what they need most—a powerful online presence, reservation system, legal agreements, insurance, merchant solutions and management software to simplify the process of running a storage facility. On top of that, OpenUnit gives facilities: • Team Management & Communication: Every account includes a space that lets you share messages with co-workers & head office. All without reaching for a separate app. • Payments & Point-of-Sale: Increase your revenue with payment options that support all card types, and increase in-store purchases with Point-of-Sale (POS) software. • Accounting & Bookkeeping: From sales and purchases to cashflow, taxes and reporting. OpenUnit Books will make you feel like a professional accountant, even if you aren't.
Openbase
Open-source library discovery
Openbase was the leading platform for developers to discover and choose open-source libraries. It offered countless reviews, metrics, and insights enjoyed by millions of developers worldwide. Discontinued in 2023.
Openland is a messenger for communities. It is focused on fundamental human needs: making new friends, safe self-expression, and learning from others. Openland is a home for some of the most active and supportive chat communities on the Internet. Anyone can start and grow their own community on Openland, for free. Openland was founded in 2017 and is based in San Francisco. The company is backed by 30 prominent venture investors, including Y Combinator, Gagarin Capital, Sinai Ventures, Soma Capital, Liquid 2 Ventures, and Rainfall Ventures.
Opennote is the one space for everything you study, turning chaos into clarity. Most learners struggle with scattered knowledge across different apps and tools that don't understand their learning style. Opennote changes that with a note-taking platform where AI knows your style, connects to your existing knowledge bases and the web, and provides proactive feedback and edits—right where you're already working.
Openroll gives companies real-time intelligence on compensation, what competitors pay, who they’re targeting, and how they’re expanding. Instead of guessing, Openroll helps you win the talent game with hard data and actionable insights. Learn more at https://www.openroll.com
Today, biologists spend too much time pipetting by hand. We think biologists should have robots to do pipetting for them. People doing science should be free of tedious benchwork and repetitive stress injuries. They should be able to spend their time designing experiments and analyzing data. That's why we started Opentrons. We make robots for biologists. Our mission is to provide the scientific community with a common platform to easily share protocols and reproduce each other's results. Our robots automate experiments that would otherwise be done by hand, allowing our community to spend more time pursuing answers to some of the 21st century’s most important questions.
Operand is building an AI to replace traditional consulting. We help businesses make better decisions by deeply analyzing their data across all sources—something consultants can’t do at scale. We’re starting in e-commerce and retail, where the businesses’ high data density and real-time feedback loops allow us to show impact fast. Our first capability is pricing and discount strategy. Operand considers everything—competitor pricing, ad strategy, inventory, and more—to ensure businesses maximize profit. And unlike other AI solutions, every Operand result is verified by human experts, including ex-MBB consultants, so you get actual impact, not just AI hype. We’re already generating 6-figure P&L improvements for early customers.