Altair GraphQL Client
Feature-rich desktop and web client for debugging GraphQL servers
48 tools in our directory are marked as best for Backend developers, from 14 sections: APIs (16), Databases (9), Testing & QA (4), Dev Utilities (3) and 10 more sections.

Feature-rich desktop and web client for debugging GraphQL servers

Multi-model database for graph, document and search data

Game-style coding course for backend, DevOps and data paths



Build your own Redis, Git, SQLite or Kafka from scratch

Draw database ER diagrams by writing simple DBML code

Open-source database client for SQL and NoSQL, desktop or web

Lightweight command line tool for database migrations

Run apps, agents and sandboxes on fast hardware-isolated VMs

Cross-platform GraphQL server with plugins, caching and rate limiting

Stores and controls access to secrets, keys and certificates

Error tracking, logging and simple APM for developer teams

Open source web app for building and testing API requests


Friendly command-line and desktop client for testing HTTP APIs


Open source desktop client for testing HTTP, GraphQL and gRPC APIs

JavaScript testing framework that runs with little or no setup

Command line processor for filtering and transforming JSON data

Standard vocabulary for describing and validating JSON data

Decode, verify and generate JSON Web Tokens in your browser


Terminal interface for browsing and managing Kubernetes clusters

Create and run mock APIs locally with free open-source tools

Document database with vector search, self-hosted or in the cloud

Managed MongoDB database service for apps, search and AI agents


Open standard for describing HTTP APIs in a machine-readable way

Generates API clients, server stubs and docs from OpenAPI


Consumer-driven contract testing for APIs, web apps and microservices

Open-source vector search extension for PostgreSQL

Extensible GraphQL API built on top of PostgreSQL databases

Open source relational database known for reliability and features

Open source browser automation with bindings for many languages

Self-hosted server for searching structured logs and traces




Run a local service against a remote Kubernetes cluster for debugging

Fast REST and GraphQL API client for VS Code and JetBrains IDEs

Open source platform for background jobs and durable AI agents

TypeScript framework for AI agents with built-in observability

Run apps in WebAssembly sandboxes locally or on Wasmer Edge

Open source tool for simulating APIs in tests and development

Local-first desktop API client that stores requests as files in Git

Distributed tracing system for finding latency in service calls
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