appwrite/appwrite: Build like a team of hundreds_ (github.com)

bregman-arie/devops-exercises: Linux, Jenkins, AWS, SRE, Prometheus, Docker, Python, Ansible, Git, Kubernetes, Terraform, OpenStack, SQL, NoSQL, Azure, GCP, DNS, Elastic, Network, Virtualization. DevOps Interview Questions (github.com)

1Panel-dev/1Panel: 🔥 🔥 🔥 现代化、开源的 Linux 服务器运维管理面板。 (github.com)

dgtlmoon/changedetection.io: The best and simplest free open source web page change detection, website watcher, restock monitor and notification service. Restock Monitor, change detection. Designed for simplicity - Simply monitor which websites had a text change for free. Free Open source web page change detection, Website defacement monitoring, Price change notification (github.com)

TencentBlueKing/bk-sops: 蓝鲸智云标准运维(SOPS) (github.com)

netdata/netdata: The open-source observability platform everyone needs! (github.com)

gravitational/teleport: Protect access to all of your infrastructure (github.com)

healthchecks/healthchecks: Open-source cron job and background task monitoring service, written in Python & Django (github.com)

mouday/domain-admin: Domain and SSL Cert monitor System. 域名SSL证书监测平台 (github.com)

OneUptime/oneuptime: OneUptime is the complete open-source observability platform. (github.com) 一个开源的服务可用性检查工具，记录服务的健康状态，如果发现服务下线，立刻发送通知，可以替代 StatusPage.io。

k8s

ddosify/ddosify: Effortless Kubernetes Monitoring and Performance Testing. Available on CLI, Self-Hosted, and Cloud (github.com)

security

imthenachoman/How-To-Secure-A-Linux-Server: An evolving how-to guide for securing a Linux server. (github.com)

robertdavidgraham/masscan: TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes. (github.com)

sbilly/awesome-security: A collection of awesome software, libraries, documents, books, resources and cools stuffs about security. (github.com)

sqlmapproject/sqlmap: Automatic SQL injection and database takeover tool (github.com)

OWASP Juice Shop | OWASP Foundation（Github）

hyperdxio/hyperdx: Resolve production issues, fast. An open source observability platform unifying session replays, logs, metrics, traces and errors powered by Clickhouse and OpenTelemetry. (github.com)

highlight.io: The open source monitoring platform.

frain-dev/convoy: The Cloud Native Webhooks Gateway (github.com)

AnalogJ/scrutiny: Hard Drive S.M.A.R.T Monitoring, Historical Trends & Real World Failure Thresholds (github.com)