uptime-kuma

Gatus

Gatus is a lightweight, self‑hosted monitoring solution that continuously checks the health of your services and endpoints. It provides real‑time status pages and integrates with popular incident management tools. Designed for DevOps engineers and system administrators, Gatus runs on any web server and offers flexible alert routing via Slack, PagerDuty, and email, all without any licensing costs.

StatusCake

StatusCake is a website and infrastructure monitoring platform offering uptime monitoring, page speed tracking, SSL certificate expiration alerts, domain expiry and DNS monitoring, and server health monitoring. Paid plans check sites as frequently as every 30 seconds from more than 30 global monitoring locations.

Huginn

Huginn is a system for building agents that monitor and act on your behalf. It can be used to automate tasks, monitor websites, and receive notifications. Huginn is a self-hosted system that can be run on your own server or in the cloud.

Prometheus

Prometheus is a free software application used for event monitoring and alerting. It records real-time metrics in a time series database (allowing for high dimensionality) built using a HTTP pull model, with flexible queries and real-time alerting. The project is written in Go and licensed under the Apache 2 license, with source code available on GitHub.

Instatus

Instatus is a cloud‑based status page platform that lets companies publish real‑time incident and uptime information to keep customers informed. It provides a simple interface for creating branded status pages without requiring engineering resources. Teams can schedule maintenance, post incident updates, and integrate with popular communication tools so alerts reach the right audience instantly. The service includes a public API for custom workflows and embeds for websites.

it-tools

it-tools is an open‑source web application that aggregates a wide range of small utilities developers and IT staff use daily. The interface is consistent and searchable, letting users quickly find converters, encoders, decoders, generators, formatters and validators. The service is available as a hosted site and can also be self‑hosted via Docker, making it suitable for teams that need a private, on‑premise instance or a quick cloud solution.