MonitorFlare

Self-hosted uptime monitoring platform with a public status page, running entirely on the Cloudflare free tier (Workers + D1 + Pages). Monitors HTTP, DNS, TCP ports, SSL certificate and domain expiry. 9 notification channels (Telegram, Slack, Discord, DingTalk, WeCom, Feishu, ntfy, webhook, email) and 9 languages. PWA status page with email subscription and RSS feed. One-click deploy with no servers or monthly costs. MIT licensed and open source.