While there are endless MP3 tag editors around, cover art support is often basic, if it’s included at all. DisCoverJ is a Java-based editor which focuses solely on cover art, automatically locating, downloading and tagging your MP3s with the right images.

Installation is straightforward on Windows, Linux and Mac. There’s no adware or other hassles and you’re ready to go in seconds.

Many graphics tools offer some sort of mosaic effect, but it’s often very basic, "let’s pixelate the image a bit and hope for the best". Pattaizer is more imaginative, and can transform your pictures using a host of mosaic-related and more abstract effects.

Some of these appear to be based on fairly standard mosaic effects, for example replacing blocks of pixels with hexagons or lego bricks. But a "Deform control" adds a random variation to every individual component of the image, ensuring you get far more interesting results.

When you’re building a batch file it’s often necessary to display status information to the user, but Windows gives you very few tools to help. MessagePop enables creating alerts with styled text, clickable links, optional timeouts, even a "Do not show" option which allows the user to hide it in future.

This makes for a complicated syntax, but the package includes a sample MessageTest.bat file to show you how it works.

PC Hunter is an expert-level Windows tool with an array of advanced features: it’s a task manager, a Registry editor, a rootkit hunter, a file explorer, and more.

The program isn’t updated very often, but with recent releases extending its Windows 10 compatibility, we decided to check out the latest build.

Mandelbrot Fractal is an open-source fractal generator with a difference: its spectacular images are produced using pure JavaScript, no external libraries or other oddball dependencies involved.

This makes for a very simple structure, essentially just an index.html with a supporting app.css and two .js files.

Windows services can safely be ignored most of the time, but sometimes you might have to monitor them or take more control.

You could do this from the regular Control Panel app (Win+R > Services.msc), but it’s slow, and you might have to scroll through hundreds of cryptically-named services to find the one you need.

A well-designed responsive website should adapt its display to work properly on phones, tablets and desktops, but testing this on every possible device might take a while. Emmet Re:view is a free Chrome extension which displays responsive websites in various-sized views, side-by-side, enabling you to see how they work at a glance.

Visit the test website, click Emmet Re:view, and a tab opens with resizable views for each CSS media query breakpoint of your page.

AOMEI has released Backupper Standard 3.5, a major new version of its freeware Windows backup, imaging and cloning tool.

Version 3.5 introduces event-triggered scheduling of backups, support for mapped network drives as backup destinations and various other improvements and optimizations, including a fix that prevents the computer from going to sleep during the backup process.

Bluelight Filter is a free Android app which aims to reduce the harmful effects of the blue light emitted by smartphones and tablets.

This could reduce eye strain, help you sleep better, and generally make the screen easier to read.

NirSoft has released ShadowCopyView and PreviousFilesRecovery, free tools designed to help you browse Windows’ volume shadow copies and restore whatever files you need.

ShadowCopyView lists all volume shadow copies on your PC, the hard drive snapshots created by Windows Vista and later.

Oracle has released VirtualBox 5.1, a major new point release of its open-source virtual machine tool for Windows, Mac and Linux. The software enables users to run virtual PCs within a software environment.

Version 5.1 comes with the promise of improved performance, improved bug reporting and logging, wider support for different USB devices, multi-channel audio, flash storage emulation and better integration into Linux.

Choosing the right font for a document or graphic project can make a huge difference to the results, but the poor viewers in Windows and many applications make it difficult to find the font you need.

PrintMyFonts can help by displaying any or all of your fonts, enabling at-a-glance comparisons, and exporting the results as images or documents.

We’ve revisited a few veteran applications recently, but nothing that quite competes with Euler Math Toolbox, which began life in 1988 as a program for the Atari ST. These days, and still being regularly updated, the package has become a versatile suite of tools for exploring real and complex numbers, vectors, matrices and symbolic algebra.

This is all powered from a Matlab-like matrix language, and can integrate with Povray, LaTEx, even custom Python and C code for the most efficient scripts.

Just about every memory optimizer around claims that freeing up RAM will speed up your PC, but this isn't necessarily true. It all depends on how your RAM is currently being used.

Memory History Tool logs the processes using your RAM and maintains a history of the main memory hogs, helping you understand where your resources are going.

Windows 10 is currently available as a free upgrade if you are coming from Windows 7 or Windows 8.1, but this offer will not last for long. Just like everyone else, you will have to pay to get Microsoft's latest operating system after July 29. Question is, how does the free upgrade deadline impact Windows 10 Mobile?

While Windows 10 and Windows 10 Mobile did not launch at the same time, Microsoft positions the two operating systems as sister products. They have a shared core, many features in common, similar UI components, and even the build numbers are now the same as you probably know if you follow Windows Insider builds. So, understandably, there is some confusion over whether would-be Windows 10 Mobile users will have to pay for an upgrade after the Windows 10 deadline passes.