This is a curated list of the software and services our engineers actually use day to day when building, securing, and supporting business IT environments. For each tool we explain what it does, why it earns a place in our toolkit, and the situation where it is the right choice — so you can make an informed decision rather than just downloading from a list. Most of the picks below are free or have a genuinely usable free tier; where a paid product is recommended, it is because we believe it is worth the money for the job it does.

A quick note on links: some of the links on this page are affiliate links. If you sign up through them, CoreSecTech may earn a small commission at no extra cost to you. This never influences which tools we list — we only recommend products we use and trust ourselves. You can read more on our affiliate disclosure page.

🛡️ Cybersecurity Tools

Wireshark — network protocol analyzer (free)

Wireshark is the industry-standard packet analyzer. When a connection is dropping, a VoIP call sounds broken, or an application is mysteriously slow, Wireshark lets you capture the actual traffic on the wire and see exactly what is happening at the protocol level. We reach for it whenever a problem cannot be explained from logs alone. It has a steep learning curve, but even basic capture-and-filter skills will save you hours of guesswork. It is free and open source.

Nmap — network discovery and security auditing (free)

Nmap maps what is actually live on a network and which ports and services those hosts expose. We use it during every infrastructure audit to find forgotten devices, unexpectedly open ports, and services that should have been firewalled off long ago. Run it against your own network periodically; the results are often surprising and are a fast way to shrink your attack surface.

Have I Been Pwned — breach exposure check (free)

Have I Been Pwned lets you check whether an email address or password has appeared in a known data breach. We use it to vet credentials during onboarding and to convince teams why password reuse is dangerous. The Pwned Passwords feature can also be wired into your own sign-up flows to block known-compromised passwords automatically.

Burp Suite Community — web application testing (free)

Burp Suite sits between your browser and a web app so you can inspect and modify requests. The free Community Edition is enough for understanding how an application behaves and spotting obvious issues. If you run any internal web tools, learning the basics of Burp will change how carefully you think about input validation.

Bitdefender — endpoint protection

For businesses that want managed, low-noise endpoint protection, Bitdefender consistently scores at the top in independent malware-detection tests while staying light on system resources. We recommend it for offices that need reliable protection without a dedicated security team babysitting alerts.

☁️ Hosting & Cloud

Cloudflare — DNS, CDN, and DDoS protection (free tier)

Cloudflare is the first thing we put in front of almost any public website. The free tier alone gives you fast DNS, a global CDN, free SSL, and meaningful DDoS protection. Pointing your domain through Cloudflare is one of the highest-impact, lowest-effort security and performance upgrades available.

DigitalOcean — developer-friendly VPS

When a project needs a clean Linux server without enterprise-cloud complexity, DigitalOcean Droplets are our default. Predictable flat pricing, fast provisioning, and excellent documentation make it ideal for hosting Vicidial, internal apps, or staging environments. We use it heavily for test builds before deploying to client infrastructure.

Hostinger — budget WordPress hosting

For a small business or a first website, Hostinger offers managed WordPress hosting at a price that is hard to argue with, with caching and SSL handled for you. It is a sensible starting point when you do not yet need a dedicated server.

AWS Free Tier — cloud services to learn on

The AWS Free Tier is the cheapest way to learn cloud fundamentals hands-on. We point engineers here to practice with EC2, S3, and IAM in a real environment. Just set a billing alarm first — the free tier has limits, and it is easy to leave something running.

🔐 Privacy & VPN

Bitwarden — password manager (free tier)

Weak and reused passwords are still behind a huge share of breaches we see. Bitwarden is the password manager we recommend to everyone: open source, audited, and free for individuals, with affordable team plans. If you adopt one tool from this page, make it this one.

Proton Mail — encrypted email (free tier)

Proton Mail provides end-to-end encrypted email with a usable free tier. We suggest it for sensitive correspondence where standard mailboxes are not appropriate, and for anyone who simply wants their email provider out of their message contents.

NordVPN — consumer VPN

For staff working from cafes, airports, or other untrusted networks, a reputable VPN protects traffic in transit. NordVPN is a solid, well-audited consumer option. Note that a VPN protects the connection — it is not a substitute for endpoint protection or good password hygiene.

🤖 AI Tools for IT Pros

Claude — long-context AI assistant (free tier)

We use Claude for drafting documentation, explaining unfamiliar log output, and reviewing scripts before they touch production. Its large context window is genuinely useful for pasting in long configs or logs and asking focused questions. As always with AI output, verify before you run anything against live systems.

ChatGPT — general-purpose AI (free tier)

ChatGPT is a capable all-rounder for scripting help, quick research, and turning rough notes into clear writing. We treat its answers as a fast first draft to be checked, not as authoritative — especially for security-sensitive commands.

Perplexity — AI search engine (free)

When we need an answer with sources attached, Perplexity is faster than wading through search results. It is handy for researching error messages, comparing products, and getting cited starting points for deeper reading.

🖥️ Sysadmin Essentials

Termius — cross-platform SSH client (free tier)

Termius is the SSH client we use when managing many servers across Windows, Mac, and mobile. Synced hosts, saved snippets, and a clean interface make it far more pleasant than juggling raw terminals, and the free tier covers most individual use.

PuTTY & WinSCP — classic Windows SSH and file transfer (free)

On Windows, PuTTY remains a dependable, lightweight SSH client, and WinSCP pairs with it for drag-and-drop SFTP file transfers. Both are free, battle-tested, and still in our toolkit after many years.

Visual Studio Code & Notepad++ — free code editors

For editing configs, writing scripts, and reviewing code, VS Code is our main editor thanks to its extensions and remote-SSH support. For quick edits on Windows, the lighter Notepad++ is perfect. Both are free and worth having installed.

Need help choosing or configuring any of these for your business? Our engineers set up and harden these tools for clients every week. Get in touch for a no-obligation conversation, or explore our IT services and technical guides for more hands-on detail.

Disclosure: This page contains affiliate links. We only recommend products we use and trust. See our affiliate disclosure for details.