Why These Four Categories Still Matter
RJ Software spent its active years solving a specific class of problem: the everyday Windows friction that Microsoft never quite smoothed away. Task scheduling, unit conversion, time-zone confusion, calculator depth — these weren't glamorous problems, but they were real ones, and RJ's small utilities addressed them with a directness that bloated commercial software rarely matched. The company is gone now, and its apps have quietly aged past the point of practical use. What remains is the problem set.
This piece works through four categories where RJ Software left a mark — task scheduling, calculators, PC optimization, and world clocks — and names the strongest current options in each. The goal isn't an exhaustive roundup; it's a tighter list of tools that genuinely earn their place on a modern Windows machine. Where RJ's own apps are still worth a mention, they get one.
Task Schedulers: Automation Without Babysitting
A task scheduler does one thing that no amount of personal discipline can reliably replicate: it acts at the right moment whether you remember to or not. Windows ships with its own Task Scheduler, built into every version since NT, and for simple triggers — run this script at 9 a.m. on weekdays — it's adequate. The moment your needs grow more complex, adequate stops being enough.
Advanced Task Scheduler sits at the serious end of the market. It handles dependencies between tasks, lets you chain actions, and offers scheduling depth that leaves the Windows native tool looking thin. It's commercial software with a corresponding price, but for anyone managing a small business workflow or a home server with real automation needs, the feature set justifies the cost. The interface is dense but logical; invest an hour learning it and the return is sustained.
Z-Cron takes a different approach. Modeled loosely on the Unix cron system, it uses a text-based rule format that developers and power users will recognize immediately. It's free for personal use, runs as a Windows service (meaning it fires tasks even when no user is logged in), and handles time-zone-aware notifications gracefully — a detail that matters if you're scheduling anything that crosses midnight or involves remote teams. Non-programmers may find the syntax steep; everyone else will appreciate the precision.
RJ Software's own Clockwise deserves a mention here, even in a forward-looking article. In its day it occupied the middle ground neatly — more approachable than Z-Cron, less expensive than enterprise schedulers, with keystroke-triggered activation for quick ad-hoc reminders alongside its recurring-task engine. It synced to an NTP server3 for accuracy and could play a WAV file or open an application as its notification action. It no longer installs cleanly on current Windows versions, and it's unsupported, but understanding what it did well clarifies what to look for in a replacement. For most former Clockwise users, Z-Cron covers the workflow at no cost; Advanced Task Scheduler covers it with more polish for a fee.
The broader principle: start with Windows Task Scheduler for anything simple. Graduate when the native tool starts requiring workarounds.
| Advanced Task Scheduler | Z-Cron | |
|---|---|---|
| Model | Commercial, dense but logical GUI | Unix-cron-style text rules |
| Depth | Dependencies, chained actions | Runs as a service; fires with no user logged in |
| Cost | Paid, with a corresponding price | Free for personal use |
| Best for | Small-business workflows, home servers | Developers and power users |
Calculators: Deeper Than You Probably Need Until You Do
The default Windows Calculator has improved considerably since its embarrassing early years — it now includes unit conversion, date calculations, and a programmer mode with Base-n arithmetic1. For many users that's genuinely enough, and there's no shame in saying so. But there's a category of calculation task where a dedicated app pays for itself in avoided errors and saved time.
Calc Pro HD is the premium option worth knowing. It offers multiple app modes — standard, scientific, financial, graphing — in a single install, along with memory registers2 that persist between sessions and a calculation history that lets you review and re-use previous results. The interface is clean by the standards of calculator software, which is a category where UI design has historically gone wrong in interesting ways. It's a paid app, and the price is modest; the one-time licence model means no annual subscription to resent.
Calculator UI design has historically gone wrong in interesting ways. Clean is rare; cherish it.
Calculator² (Calculator Plus, as it appears in the Microsoft Store) pitches itself at the gap between the Windows default and something like Calc Pro. It adds a history tape, unit conversions, and a currency converter with live rates. Free with optional upgrades, it's a reasonable first step for anyone who finds the native calculator limiting without wanting to commit to a full purchase. The freemium structure is transparent rather than aggressive, which matters more than it should in a category full of apps that nudge users toward paid tiers at every turn.
Wolfram Alpha is the wild card and, for many purposes, the most powerful entry on this list. Technically it's a computational knowledge engine rather than a calculator, but the distinction is academic when you're trying to compute the Gamma function4 of a non-integer, check a financial formula, or solve a system of equations by typing it in plain English. It's browser-based, which is either a feature or a limitation depending on how you work, and the free tier handles a remarkable range of queries before the paywall appears. The Pro tier unlocks step-by-step solutions, which makes it genuinely useful for anyone learning mathematics rather than just retrieving answers.
RJ Software's FNA (Free Number Assistant) operated in a different register entirely — a no-cost, no-installation-hassle desktop calculator with an expression evaluator that let you type a full mathematical expression rather than punching numbers one operation at a time. It never tried to compete with Wolfram Alpha on depth. What it did was give Windows users a fast, reliable desktop calculation tool without a price tag or a browser dependency. For pure replacement utility, Calculator² comes closest to that original experience.
PC Optimizers: The Honest Version of a Crowded Category
Optimization software is where the Windows utility space earns most of its bad reputation. The category is full of tools that manufacture urgency — scan results reported in alarming red, "thousands of errors" that turn out to be harmless registry entries — and then demand payment to fix problems that either don't exist or would never affect performance. Honest optimization software is rarer, but it does exist.
The category is full of tools that manufacture urgency — scan results reported in alarming red, 'thousands of errors' that turn out to be harmless registry entries.
— From this essay's own honest-optimization warning
CCleaner, from Piriform (now owned by Avast), remains the most widely recognized tool in the category and, used correctly, one of the most useful. Its core function — clearing temporary internet files5, cached browser data, and application leftovers — is legitimate and effective. The free version does this competently. The paid tier adds automated scheduling and real-time monitoring, which are worth the upgrade if you run the tool regularly. Use the registry cleaner with restraint; it rarely addresses genuine performance problems and occasionally creates new ones.
Iolo System Mechanic takes a broader approach, combining junk-file removal with startup tuning, memory optimization, and background process management. It's subscription-based, which sets the total cost of ownership6 higher than a one-time purchase, but the feature set is correspondingly deeper. Iolo has been in the category long enough — the company has operated since the late 1990s — to have earned a reputation for doing what it claims rather than exaggerating scan results for upsell purposes.
IObit Advanced SystemCare covers similar ground at a lower price point, with a more consumer-friendly interface and a free tier that's genuinely functional rather than a stripped demo. The software is more aggressive about promoting its own ecosystem of companion tools than CCleaner or Iolo, which is worth knowing before you install it. If you can ignore the upsell prompts, the core optimizer is solid.
The honest advice for this category: any of these three tools, used once a month and combined with keeping Windows Update current, will serve a machine well. The gains from heavy optimization software are real but incremental. What they prevent is the slow accumulation of junk — temporary files, orphaned startup entries, cached data — that gradually makes a responsive machine feel sluggish without any single identifiable cause.
World Clocks: One Specific Problem, Solved Well
World clock apps exist to solve one recurring, low-drama problem: knowing with confidence what time it is for the person you're about to call. Every wrong-timezone meeting invitation is a small argument for having this information visible and accurate on your desktop.
World Clock – Time Zones (available from the Microsoft Store and various platforms) handles the fundamentals cleanly: add cities, see their current times, check overlap for scheduling. The interface is designed for quick reference rather than deep configuration, which suits the use case. It handles daylight saving transitions automatically.
Sharp World Clock is the option for users who want more control. It supports a large number of simultaneous zones, offers desktop widget modes that sit unobtrusively on the Windows taskbar or desktop, and includes alarm functions tied to specific time zones — the time-zone-aware notifications feature that sounds minor until you've once set an alarm in the wrong zone. It's been actively maintained and runs well on current Windows versions.
ZoneView takes the minimalist path: a small, clean display of selected time zones, no unnecessary features, no configuration maze. For anyone whose need is genuinely just "what time is it in London right now," a tool of this kind is all you need, and World Clock – Time Zones fills that role today. The best world clock app is the one with the fewest steps between opening it and reading the answer.
The through-line across all four categories is the same principle that made RJ Software's tools worth using in the first place: do one thing, do it reliably, don't make the user work harder than the task requires. The specific apps change; the standard doesn't.
The specific apps change; the standard doesn't.
| Category | RJ original | Where to start today |
|---|---|---|
| Task scheduling | Clockwise | Windows Task Scheduler, then Z-Cron or Advanced Task Scheduler |
| Calculation | FNA | Windows Calculator, then Calculator² or Calc Pro HD; Wolfram Alpha for depth |
| PC optimization | QuadRate | CCleaner; Iolo System Mechanic or IObit for broader suites |
| World clocks | ZoneView | World Clock – Time Zones, or Sharp World Clock for control |
The Shelf, Linked Onward
The archive's shelf points every RJ tool at one maintained counterpart. These are the four with a front door worth walking through:
- Base-n arithmetic — Calculations in number bases other than decimal, e.g. binary, hexadecimal. ↩ back
- memory registers — Named storage slots that retain numeric values between sessions. ↩ back
- NTP server — Network Time Protocol server that synchronizes computer clocks over the internet. ↩ back
- Gamma function — Mathematical extension of factorial to non-integer and complex numbers. ↩ back
- temporary internet files — Cached web content stored locally to speed up browser loading. ↩ back
- total cost of ownership — Full long-term cost of a tool including fees, time, and switching costs. ↩ back