Developer Tools MCP Servers

Invoice Ninja is an open-source invoicing and billing platform for freelancers and small businesses. Create and manage invoices, track payments, handle clients and projects, manage expenses, and automate billing workflows for streamlined financial operations.

JavaDocs Dev is a documentation platform and API reference for Java development, providing documentation, code examples, and API references for Java libraries, frameworks, and development tools. It serves as a central resource for Java developers.

Format, validate, and minify JSON. Reports detailed parse errors with line numbers and structure statistics. Pure computation — no external calls.

Decode and inspect JSON Web Tokens (JWT) without signature verification. Extract header, payload, claims, and expiration status. Supports JWS (signed) tokens. Pure computation — no external calls, no secrets needed.

JxBrowser MCP Server provides developers with resources and documentation to effectively utilize the JxBrowser library for embedding web content in Java applications. It is ideal for software engineers looking to enhance their applications with web capabilities.

The Kael MCP Server appears to offer a variety of tools for web interaction, including fetching data, searching, and processing tasks. It would be beneficial for developers looking to automate web-related tasks and integrate various web functionalities into their applications.

Klaus API is a developer tool providing access to KlausApp's conversation review and customer service quality metrics, allowing businesses to enhance their customer support operations. Use it to automate data retrieval and integrate quality insights into existing systems.

Komodor is a Kubernetes troubleshooting and monitoring platform. Provides change tracking, automated root cause analysis, and incident management for Kubernetes clusters and workloads.

Selise Blocks is a multi-tenant application development platform. Manage projects, authentication (social login, MFA, CAPTCHA), roles and permissions (RBAC), GraphQL schemas, translations/i18n, and data gateway configuration.

Human-in-the-loop remote control for AI coding agents. Routes agent questions to Slack so developers can respond from their phone, unblocking Claude Code, Cursor, Copilot, and Gemini CLI workflows remotely.

LaunchDarkly is a feature management platform that enables software teams to manage, control, and experiment with feature releases using feature flags, which can be toggled on or off in real-time. Use it to ensure safe and efficient deployment of features, reducing risk and improving agility in software development.

Lob provides an API for businesses to automate and manage direct mail and address verification tasks. Use it to streamline mailing operations and ensure address accuracy.

Playwright MCP server — local Chrome browser running on your machine via the desktop proxy. Full Playwright browser automation: navigate, click, type, screenshot, fill forms, run JavaScript, inspect network/console, and performance profiling with direct localhost access. Requires: pip install mcpbundles && mcpbundles proxy start

Mailosaur is an email and SMS testing platform that lets developers capture, inspect, search, and analyze messages sent by applications. Use it to automate email verification flows, test deliverability (SPF/DKIM/DMARC/SpamAssassin), and manage virtual inboxes (servers) for isolated test environments.

Mailtrap is a tool designed for safe email testing and development, allowing users to capture, analyze, and debug outgoing email messages before sending them to real recipients. It helps developers ensure emails are formatted correctly and contain the expected content.

This server provides internationalization (i18n) tools and resources, helping developers implement language support and localization in their applications. It is particularly useful for teams looking to enhance user experience across different languages and regions.

Mantle is a billing and subscription management platform for Shopify apps. Use the Core API to list customers, manage subscriptions, track usage events, and access affiliate data across your Shopify app portfolio.

Convert documents and files to Markdown format. Powered by Microsoft's MarkItDown library, this tool converts PDFs, Word documents, Excel spreadsheets, PowerPoint presentations, HTML pages, images (with OCR), audio files, and more to clean Markdown text.

Merge is an API that enables the integration of applicant tracking systems (ATS) into applications, providing data synchronization and access to ATS functionalities. It's used to streamline recruitment processes by consolidating ATS data and enabling seamless integration within HR systems.

MidOS - MCP Community Library serves as a resource hub for developers, providing tools for searching and accessing community-contributed knowledge and skills. It is particularly useful for those looking to enhance their development capabilities through shared resources.

Workflow: 'Help moderate content and maintain quality'. Flag spam and offensive content, review suggested edits, vote to close low-quality questions, delete inappropriate content, monitor site event streams, track edit history, and manage OAuth tokens. Keep the community healthy and high-quality.

MongoDB MCP server for cloud and self-hosted database operations. Works with MongoDB Atlas, self-hosted MongoDB, AWS DocumentDB, and Azure Cosmos DB with MongoDB API. Connect to local MongoDB instances with: pip install mcpbundles

Workflow: 'Show me my Stack Overflow activity and notifications'. Check inbox messages, view notifications, track reputation changes, see badges earned, monitor your activity timeline, and explore your presence across the Stack Exchange network. Your personal Stack Overflow command center.

MySQL MCP server for powerful open-source relational database operations. Execute SQL queries, manage relational data with high throughput, support web applications and data warehousing, and integrate with popular frameworks for scalable database operations. Connect to local databases with: pip install mcpbundles