News & trends

• Ars Technica — deep tech & infra news

• The Register — industry news with sysadmin flavor

• InfoQ — architecture, DevOps, SRE

• Hacker News — tech discussion feed

• Slashdot — long-running tech news

• Lobsters — curated dev/sysadmin discussions

• Dark Reading — security news

• BleepingComputer — security & Windows fixes

• KrebsOnSecurity — investigative security

• SANS Internet Storm Center — daily threat diary

• SRE Weekly — SRE/cause-of-failure roundups

Communities & Q&A

• Stack Overflow • Server Fault • Super User

• Spiceworks Community — practical IT ops forums

• Microsoft Q&A — official answers

• VMware Communities

• Reddit: /r/sysadmin • /r/networking • /r/devops

• dev.to — articles/how-tos

Standards, best practices & policy

• IETF Datatracker • RFC Editor • IANA

• NIST SP 800 • NIST Cybersecurity Framework

• CIS Benchmarks • CIS Controls

• MITRE ATT&CK • CWE

• CISA — alerts, hardening guides

• OWASP — app-sec guidance

• DISA STIGs — security baselines

• ISO/IEC 27001 overview

Operating systems (Windows & Linux)

• Microsoft Learn • Windows Release Health

• Sysinternals • PowerToys

• Linux: Ubuntu Docs • Debian Wiki • Arch Wiki

• Enterprise: Red Hat • SUSE • AlmaLinux • Rocky Linux

Virtualization & containers

• Docker Docs • Podman • Kubernetes Docs

• CNCF Landscape — cloud-native ecosystem map

• Proxmox VE Wiki • VMware vSphere Docs • Hyper-V • KVM • LXD

• Security: OWASP Docker Security Cheat Sheet

Cloud (AWS/Azure/GCP) & architecture

• AWS: Docs • Well-Architected • Pricing Calculator • re:Post

• Azure: Docs • Architecture Center • Pricing

• Google Cloud: Docs • Architecture • Calculator

• Edge/CDN: Cloudflare Docs

DevOps, IaC & automation

• HashiCorp: Terraform • Packer • Vault • Consul

• Pulumi Docs • Ansible

• CI/CD: GitHub Actions • GitLab • Jenkins

• GitOps: Argo CD • Flux • Helm • Kustomize • SOPS

Monitoring, observability & logging

• Prometheus • Grafana • Loki • OpenTelemetry

• Logs/SIEM: Elastic Stack Guides • Splunk • Graylog

• Infra monitoring: Zabbix • Nagios • Icinga

• App monitoring: Sentry • Datadog • New Relic

• Uptime: Uptime Kuma

Networking

• Vendors: Cisco DevNet • Cisco Docs • Juniper TechLibrary • MikroTik Docs • Ubiquiti Help • Aruba Tech Docs

• Firewalls: pfSense Docs • OPNsense Docs

• Tools/refs: Wireshark Docs • ipcalc • SubnetOnline

• Internet intel: HE BGP • Cloudflare Learning • Cloudflare Radar • RIPEstat

• Troubleshooting: MTR • Speedtest • Measurement Lab

Security & threat intelligence

• Vuln data: NVD • CVE List • CVSS Calculator • CWE • Exploit-DB

• Frameworks/baselines: ATT&CK • OWASP Top 10 • SANS Cheat Sheets • MS Security Baselines

• Malware/IOC: VirusTotal • Hybrid Analysis • ANY.RUN

• Exposure/OSINT: Have I Been Pwned • Shodan • Censys • GreyNoise

• Abuse/fraud: AbuseIPDB • PhishTank • AlienVault OTX

Identity, SSO & directory

• Microsoft Entra ID • Okta Developer • Auth0 Docs • Keycloak Docs • FreeIPA

• Protocols: OpenID Specs • OAuth 2.0 • LDAP.com

MDM & endpoint management

• Microsoft: Intune • ConfigMgr/MECM • Windows Autopilot

• Apple: Jamf Pro • Munki

• Package mgmt: Chocolatey • winget • PDQ Deploy/Inventory

Email, DNS & collaboration

• Microsoft 365: Admin • Exchange Online • SharePoint Admin

• Google Workspace Admin: Help Center

• Mail stack: Postfix Docs • Dovecot • SpamAssassin • OpenDMARC • DMARC.org • MXToolbox

• DNS tools: DNSViz • IntoDNS • ICANN Lookup • Cloudflare 1.1.1.1

Databases

• PostgreSQL • MySQL • MariaDB • MongoDB • Redis • SQLite • Cassandra • Elasticsearch

Scripting, reference & utilities

• Languages: PowerShell • Bash Manual • Python • Go • DevDocs

• Helpers: ExplainShell • Regex101 • JSONLint • YAML Lint • JWT.io • crontab.guru

• Tools: Nmap • OpenSSH • OpenSSL • 7-Zip • Notepad++ • WinMerge • Beyond Compare • KeePass • Bitwarden Help • Sysinternals • NirSoft • iperf3 • Rufus

Backup, storage & filesystems

• Veeam Help Center • BorgBackup • restic • Bacula • Rclone

• NAS/obj storage: TrueNAS Docs • Ceph Docs • MinIO Docs

• Imaging: FOG Project

Deployment, imaging & patch (Windows)

• MDT • Windows ADK • WSUS

• Windows Autopilot • SCCM/MECM

• Software deploy: Ninite Pro • PDQ Deploy • Chocolatey (Business docs)

SIEM, incident response & forensics

• Wazuh • osquery • Sigma HQ • TheHive • MISP

• MITRE D3FEND • The DFIR Report • Volatility • Autopsy/Sleuth Kit • KAPE

Compliance & privacy

• GDPR (official) • PCI SSC Library • SOC 2 (AICPA)

• CIS Controls • EFF • Privacy Guides

Asset mgmt, ITSM & remote tools

• Asset/CMDB: Snipe-IT • GLPI • OCS Inventory

• ITSM: ServiceNow Docs • Jira Service Management • Freshservice • Zendesk

• Remote: RustDesk • AnyDesk • TeamViewer • MeshCentral

Training, labs & learning

• Microsoft Learn • AWS Skill Builder • Google Cloud Skills Boost • Linux Foundation Training

• MOOCs: edX • Coursera • freeCodeCamp

• Security labs: TryHackMe • Hack The Box • OverTheWire • CyberDefenders • Blue Team Labs Online

• Performance/web: web.dev • GTmetrix • PageSpeed Insights

Status & outage tracking

• Vendor status: AWS • Azure • Google Cloud • Cloudflare • GitHub • Atlassian • Zoom

• Aggregator: Downdetector