Developer Tools Startups

OpenMake Software makes Meister, a build automation tool that produces repeatable, secure software compiles using a declarative model, with features such as SBOM build audits, dependency scanning, build acceleration, and CI/CD integration. Aimed at large enterprises and originally serving the financial sector, it addresses software supply chain security within the DevOps ecosystem.

1 investor

Open Source Endowment (OSE) is a community-led nonprofit building a permanent endowment fund that invests donations and distributes the investment returns as grants to fund critical open source software projects. It targets maintainers and the global open source supply chain, using a data-driven grantmaking model co-developed with its members and the OSS community.

1 investor

OpenBB built financial infrastructure software and platforms for investment research, including a terminal, SDK, workspace, copilot, and Excel add-in, serving buy-side and sell-side financial institutions and individual analysts. The company has transitioned to open-sourcing its product suite under a permissive license after being unable to achieve sustainable commercial product-market fit.

1 investor

OpenBuilder provides a backend platform and visual debugging tools for developers to build applications without per-message costs. It offers OAuth and API integrations with third-party services including documentation, payment, CRM, email, and Slack.

1 investor

OpenClaw is an open-source, self-hosted AI agent that runs on a user's own machine and performs personal tasks such as organizing email, sending messages, managing calendars, and checking in for flights, controlled through chat apps like WhatsApp and Telegram. Aimed at individuals and technical users who want a hackable personal assistant they control, it runs on macOS, Linux, and Windows and supports custom skills and plugins.</parameter> <parameter name="founders">[{"full_name": "Peter Steinberger", "title": "Creator", "twitter_handle": "steipete"}]

1 investor

OpenComputer is an open durable runtime for AI agents, running each session on a persistent virtual machine with full OS access that hibernates when idle and resumes with state intact after crashes or redeploys. It offers agents-as-code deployment, checkpoints, and elastic VMs for developers building on harnesses like Claude Agent SDK and OpenCode.

1 investor

OnePatch offers an AI-based site reliability engineering tool that instruments production services, monitors their behavior, detects incidents, and works to resolve them through to a shipped fix. It is aimed at engineering and operations teams responsible for on-call and service reliability.

1 investor

OpenCV is a computer vision library that provides GPU-accelerated functionality for image processing and parallel computations. It enables developers to run vision algorithms on NVIDIA CUDA-enabled graphics processors while maintaining consistency with its CPU-based implementation.

1 investor

OpenFn is an open-source integration and workflow automation platform that connects identity systems, payment rails, registries, and legacy systems to orchestrate digital public infrastructure and automate public service delivery. It serves governments and NGOs, offering AI-assisted workflow building, 100+ pre-built adaptors, and flexible hosting across cloud or on-premise environments.

1 investor

OpenHack is an AI security engineer that scans code, runs autonomous pentests, verifies vulnerabilities with working proof-of-concept exploits, and prioritizes findings by business impact, generating fix pull requests. It serves engineering teams at startups and enterprises, covering application code, authentication flows, APIs, dependencies, and secrets.

1 investor

OpenInt provides a platform for teams to build product integrations quickly using no-code or low-code tools, offering unified APIs for data operations or direct database synchronization.

1 investor

OpenMSP is a directory and community platform cataloging open-source software alternatives for managed service providers (MSPs), with vendor pricing comparisons and implementation guides across IT, network operations, security operations, and business operations. It aims to help MSPs reduce software costs and includes tools such as a stack builder and community initiatives.

1 investor

OpenObserve is an OpenTelemetry-native observability platform that ingests and queries logs, metrics, and traces using SQL on a columnar Parquet store built in Rust on the DataFusion engine. It targets engineering and SRE teams as a lower-cost alternative to tools like Datadog, Grafana, and Elastic, and includes an AI SRE agent for incident triage and root-cause correlation.

1 investor

OpenProse is a declarative language and framework for orchestrating multi-agent AI workflows, allowing developers to write contracts in Markdown that compile into executable topologies for coordinating AI agents running on Claude, Codex, or other language models.

1 investor

OpenSMTPD is a free, open-source server-side implementation of the SMTP protocol as defined by RFC 5321 with standard extensions, enabling machines to exchange email over SMTP. It is part of the OpenBSD Project and distributed under an ISC license.

1 investor

OpenSquare is a blockchain-focused development team building products for the decentralized/Web3 ecosystem. The company works on front-end infrastructure tooling and web and mobile applications within the crypto space.

1 investor

OpenSRE is an open-source, self-hosted CLI agent that diagnoses failed CI/CD builds by reading logs, testing hypotheses, and opening pull requests with suggested fixes. It runs on a team's own infrastructure using their own models and is aimed at engineering teams managing build and pipeline reliability.

1 investor

OpenSteer builds specialized AI agents that perform autonomous work by browsing the web, integrating with user tools, and executing on schedules either in the cloud or on-premises. The platform serves developers and enterprises looking to automate business processes and workflows.

1 investor

Openverse Network is building blockchain infrastructure for a "value internet," including protocols for cross-chain value transfer, naming, unified identity, inter-blockchain communication, and an EVM-compatible operating system for running public, consortium, and private chains. It serves developers and institutions who want to build or migrate decentralized applications and interoperate across blockchains.

1 investor

Oplane builds continuous architectural threat modeling software for AI-first engineering teams, automating security analysis that runs alongside code changes rather than as periodic reviews. The platform is designed for development teams shipping features daily, particularly in environments where AI agents and AI-generated code introduce new security risks.

1 investor

Opper is an EU-hosted AI gateway that provides a unified, OpenAI SDK-compatible API for accessing 300+ AI models across text, image, voice, and video, with automatic failover, tracing, and agent-building SDKs. It serves developers and companies with GDPR compliance, EU data residency, and AI governance/control-plane features.

1 investor

Opral develops infrastructure for file-based workflows, including Lix, a version control system for any file format, and Inlang, an open-format translation management system for teams.

1 investor

The opsani.com domain now presents content for Splunk AppDynamics, a full-stack observability product that links application and infrastructure performance to business metrics across hybrid and three-tier environments. It serves IT operations, engineering, network, and security teams seeking to troubleshoot performance and security issues.

1 investor

Opsgenie is an incident management and on-call alerting tool for Dev, Ops, and IT teams, offering on-call schedules, escalation policies, and incident workflows. The page focuses on migrating existing Opsgenie setups into Atlassian's Jira Service Management, which provides AI-assisted alert triage, root cause analysis, and incident prevention.

1 investor