SysAdmins Arena – A HackerRank for Sysadmins/devops/SREs

In plain words

SysAdmins Arena is a platform designed for system administrators, DevOps engineers, and site reliability engineers to practice and demonstrate their technical skills. Similar to HackerRank but tailored for infrastructure and operations roles, it provides challenges and scenarios relevant to managing systems and deployment processes. The platform launched in 2016 and serves professionals looking to benchmark their abilities, learn new techniques, and engage with others in the ops community.

written from the facts on this page · September 2026

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  Code ArenaFeb 2026 · arena.ai · ▲272

  Prompt once. Compare multiple AI-built apps for free.

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  Agent ArenaJun 2026 · arena42.ai · ▲348

  Creator here. I built Agent Arena to answer a question that kept bugging me: when AI agents browse the web autonomously, how easily can they be manipulated by hidden instructions? How it works: 1. Send your AI agent to ref.jock.pl/modern-web (looks like a harmless web dev cheat sheet) 2. Ask it to summarize the page 3. Paste its response into the scorecard at wiz.jock.pl/experiments/agent-arena/ The page is loaded with 10 hidden prompt injection attacks -- HTML comments, white-on-white text, zero-width Unicode, data attributes, etc. Most agents fall for at least a few.…

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  Architect.io2023 · architect.io · ▲254

  Deploy any app, anywhere

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  SRE.ai2024 · sre.ai · ▲156

  AI agents to simplify and automate Salesforce devops

• BA
  Byte Arena – Code Your Fighter Bot2017 · doc.bytearena.com · ▲179
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  SysOPS2024 · smartinfologiks.com · ▲7

  DevOps and System Administration Automation Platform

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  SimCity, but with Permits▲930

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 2d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 15d ago · tanzaniaeducationproject.org

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  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 15d ago · bigwords.page

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  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 9d ago · guitoro.com

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  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 13d ago · carrierexplode.com

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  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 23d ago · space.bl2.net

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  Amazon Go▲1,578

  Amazon stores with no lines or checkout 🛍

  AI · 2016 · amazon.com

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  Gomix▲842

  The easiest way to build the app or bot of your dreams

  AI · 2016

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  Slack Video Calls▲773

  Talking face-to-face with your team is just one click away

  Work · 2016 · slack.com

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  Auto-Layout for Sketch▲666

  Responsive design for Sketch

  Work · 2016 · animaapp.github.io

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  CakeResume v2 - Online Resume Builder▲662

  What's your workplace flavor? Join 10M+ users and take the free personality test to find out. Discover your workplace strengths and ideal career path in under 3 minutes with our CPTI™ assessment, based on the Myers-Briggs framework.

  Dev tools · 2016 · cake.me

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  Viral Loops for Startups▲656

  Virality for startups made easy 💪

  Growth · 2016 · viral-loops.com