Appsmith
appsmith.com
Open-source low-code platform for building internal tools and admin panels — a self-hostable alternative to Retool.
Why it is useful
Appsmith lets developers drag-and-drop UI components (tables, forms, charts) and wire them to any database or API, generating internal dashboards and CRUD apps far faster than building from scratch. Self-hosting avoids Retool's per-user pricing, which adds up quickly for teams building multiple internal tools.
More in Developer Utilities
Other developer utilities you might not have heard of.
- Crontab GuruVisual editor and validator for cron schedule expressions with human-readable descriptions.
- Explain ShellPaste any shell command and get a visual breakdown of every flag and argument with documentation.
- mitmproxyAn open-source interactive HTTPS proxy for intercepting, inspecting, modifying, and replaying HTTP and HTTPS traffic from any application — desktop, mobile, CLI, or IoT device.
- PublicWWWSearch engine for source code snippets across millions of live websites.
- Security HeadersFree HTTP security header scanner that grades websites and explains what each missing header protects against — actionable before deployment.
- k6An open-source load testing tool that uses JavaScript scripts to define virtual user scenarios, with output compatible with Prometheus and Grafana and support for HTTP, WebSockets, and gRPC.