Aviationstack ◆
Aviationstack is a scalable REST API for real-time flight tracking, historical flight data, airport info, and global aviation data.

ZizkaDB (Developer Tools): ZizkaDB is an operational database for AI agents with replay, lineage, and drift alerts. Pricing: from $0 (self-hosted). (data verified August 2026)
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ZizkaDB is an operational database designed for AI agents in production. It goes beyond simple logging by providing session replay, causal lineage, and drift alerts, so you can debug and correct agent behavior before users notice issues.
Built for engineering teams that build and deploy AI agents, ZizkaDB helps those struggling with blind debugging, silent prompt changes, and policy violations. It's ideal for teams using Python, TypeScript, MCP, or REST. If you're just experimenting with AI, this might be overkill; it's for production-grade deployments.
Use ZizkaDB to replay any session end-to-end, trace decision chains, and measure drift against baselines. Catch regressions before they ship—for example, when a prompt update changes refund answers, ZizkaDB alerts you and pinpoints the root cause, letting you roll back quickly.
Editorial score from our review methodology — not user ratings.
ZizkaDB pricing: from $0 (self-hosted).
Free under AGPL license. Run via Docker Compose on your own infra. Includes Activity, Behavior, Reports, and Suggestions.
Hosted at db.zizka.ai. Includes all self-hosted features plus Fleet ranking across agents and projects. Pricing available on request.
No free trial mentioned, but the self-hosted version is free to use.
Don’t take our word for it — ask your AI about ZizkaDB