Open-source tools, tested in the lab.
Zabbix, LibreNMS, and Uptime Kuma all fit on a $45 Raspberry Pi—but only one survived our seven-day fake-outage drill without turning into a notification firehose. Here is the setup time, alert counts, and real cost breakdown.
We loaded Vaultwarden and Passbolt onto a single used thin client and let twelve real coworkers hammer both for 60 days. Setup was the easy part — the invoice that actually stung was the labor hidden behind onboarding, recovery, and one very bad Tuesday with the admin account.
A twelve-person US office was quoted $22 a seat per month for hosted VoIP. We swapped in FreePBX on a recycled Dell, ran three SIP trunk providers against the same call load for a month, and tracked every dollar and every hour. The software was free; the surprises were compliance, failover, and a fax machine nobody mentioned.
We moved a 10-person US shop off Google Workspace and onto Mailcow on a $12 VPS, then tracked the costs that never show up on the invoice. Here is what 60 days of deliverability, spam tuning, backups, and admin time actually looked like.
We ran safe ransomware-like scripts against a $99 mini PC protected by Wazuh, Velociraptor, and CrowdSec, then compared detection, noise, CPU, RAM, setup time, and response workflow. The winner for a small IT shop was not the one with the most alerts.
Invoicing, bookkeeping, CRM, and file storage for a solo US business, all running on one mini PC for 60 days. We tracked setup hours, tax-season friction, backup failures, and the real break-even against a $30-a-month SaaS stack.
Three obsolete office PCs, sixty bucks, and a copy of Proxmox VE. We ran a real home-lab workload on e-waste for 90 days, logged every watt and every failure, and found the exact moment cheap hardware stops being a bargain.
A three-person office spent five working days on Linux Mint, and we logged every support ticket and hidden cost. The software was free; the labor bill was not.
We spent 30 days comparing a $40 router running OpenWrt with a $199 three-node mesh kit in a busy home office. The cheap box lost the coverage contest, won the bufferbloat fight, and forced us to put a dollar value on setup time.
We installed osTicket, Zammad, and UVdesk on the same $6/month VPS and ran the same ticket scenarios for a week each. Setup time, email ingestion, routing, SLA tracking, upgrades, and one messy recovery later, here is the pick for US small shops.
I replaced a consumer router with a $75 surplus thin client running OPNsense and tracked 90 days of real work-from-home traffic, video calls, VPN sessions, and power draw. The cheap firewall wins more often than I expected, but it also has a few time traps worth knowing before you buy.
Restic, Borg, Duplicati, and UrBackup cost zero dollars to license and several thousand dollars a year to operate. We model the egress fees, scripting hours, and untested-restore risk across three small-business scenarios so you can see the real number before you commit.
We stuffed llama.cpp, Ollama, LocalAI, Jan, and GPT4All onto a $239 Intel N100 mini PC and measured tokens per second, RAM ceilings, and setup pain. Two of them are worth your time on this hardware — the rest depend entirely on what you're building.