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OpenSpec is an open-source, tool-agnostic spec-driven development framework from Fission AI for AI coding assistants. It stores requirements and development artifacts as plain Markdown files in a repository, using an `openspec/` structure containing specifications and proposed changes. Its workflow supports exploratory discussions, `/opsx:propose` for generating a proposal, requirements and scenarios, a technical design, and implementation tasks, followed by `/opsx:apply` to implement the tasks and `/opsx:archive` to update the specifications. Coding agents can interact with it through slash commands or an MCP server. The project is designed for iterative, brownfield development and supports shared or cross-repository requirements through beta Stores. The CLI requires Node.js 20.19.0 or higher and is installed with npm.

Orca is a free, open-source agent development environment for running multiple coding agents in parallel on desktop, mobile, or a VPS. It runs CLI agents such as Codex, Claude Code, OpenCode, and Pi side by side, placing each agent in an isolated Git worktree so results can be compared and merged. The environment provides split terminals, a VS Code editor, diff annotation and review, browser-based Design Mode that sends selected HTML, CSS, and screenshots to an agent, native GitHub and Linear views, SSH worktrees with port forwarding, and a mobile companion for monitoring agents and sending follow-ups. Its CLI can script workflows such as creating worktrees, taking snapshots, clicking, and filling fields. Orca is designed to work with any coding agent that runs in a terminal and uses the user's own agent subscriptions.

DevAssure is an AI-powered software testing platform whose O2 agent reads code changes, maps potentially affected application flows, and validates them automatically, including through browser interactions based on plain-English expected behavior. It generates scriptless, self-healing acceptance tests and reports results for pull requests.

OpenCode is an open-source AI coding agent developed by anomalyco. It is used as a terminal-based coding agent and external coding harness, with a beta desktop application also available. The CLI includes a full-access build agent for development work and a read-only plan agent for code analysis and exploration; the plan agent denies file edits by default and asks permission before running shell commands. OpenCode also provides a general subagent for complex searches and multistep tasks, and can be installed through its shell installer, package managers, or platform-specific desktop packages.

Open Code Review is an open-source, AI-powered command-line code-review tool developed from Alibaba Group’s internal review assistant. It reads Git diffs and sends changed files to a configurable LLM through an agent with tool-use capabilities; the agent can read complete files, search the repository, and inspect other changed files for context before producing structured comments tied to source lines. Its hybrid architecture combines deterministic engineering with dynamic agent decisions: deterministic stages select and bundle files, match rules to file characteristics, and apply independent comment-positioning and reflection modules, while scenario-specific prompts and tools guide context retrieval and review. The `ocr scan` command audits complete files or directories without requiring a meaningful diff, and the project provides multilingual rules for issues including null-pointer exceptions, thread safety, cross-site scripting, and SQL injection. It supports configurable model endpoints, including OpenAI- and Anthropic-compatible endpoints, and requires Git 2.41 or newer.