There are a couple of interesting child pages, so don't forget to check them out, via the site menu.
CyberChef - this is a fantastic toolbox to keep handy and does amazing things. You simply drag an Operation into the Recipe and type some Input, then you will see Output. There is an example at From Base64 - CyberChef which might help
Free Printable Graph Paper - includes a virtual version as well
Noisli - Improve Focus and Boost Productivity with Background Noise - does what it says and very well too
Hipstersound | Ambient noise generator to create a positive work environment - an alternative
This is software I am aware of and that should be good but I have not used:
In 2026 I became aware of "bufferbloat", see Bufferbloat.net - Bufferbloat.net for more details on this.
SamKnows - Broadband Availability Checker
Time zone conversion - timeanddate.com
Convert to/from milliseconds - Current Millis ‐ Milliseconds since Unix Epoch
Laragon - portable, isolated, fast & powerful universal development environment for PHP, Node.js, Python, Java, Go, Ruby. - this is a handy solution to Web Based development on Windows, where WSL is not an option, or you want an alternative to WSL, it is a WAMP solution
Sitespeed.io - Welcome to the wonderful world of Web Performance
WebPagetest - Website Performance and Optimization Test
Security Tools Top 10 (2013) - ToolsWatch.org – The Hackers Arsenal Tools » 2013 Top Security Tools as Voted by ToolsWatch.org Readers
MD5 File - HTML5 File Hash Online Calculator - MD5, SHA1, SHA2 (SHA-256), SHA-384, SHA-512
Security Planner - gives some good security advice
Also and preferably known as TLS:
SSL Labs - Qualys SSL Labs - Projects / SSL Server Test
Symantec - SSL Toolbox
Hardeniuze, site testing - Hardenize: Comprehensive web site configuration test
Handy site for manual testing of handling bad certificates etc - badssl.com
The following sites tell you how many of a specific vehicle are "on the road". A taxed vehicle is one that can be driven on the road, as it has been properly taxed, which means it must have insurance and an MOT. There is also "Statutory Off Road Notification" or SORN, which means the owner has notified they will not drive the vehicle on public roads, and thus it is not taxed, but they do still own it.
It is worth noting that the MOT History updates immediately after an MOT Test, but the MOT and Tax option takes until the following day.
This is a file transfer format, however OpenAS2 Server Application is a useful open source product.
Linux based partition utility - GParted -- A free application for graphically managing disk device partitions, not use myself
Commercial disk/partition utility - Disk Management Software - Acronis Disk Director 12 which I heartily recommend
<input> - HTML | MDN - be sure to use the correct or best type
HTML Standard - the definitive spec on HTML 5
HTML5test - How well does your browser support HTML5? - test your browser
Relax-and-Recover - Linux Disaster Recovery - stumbled upon this, never used but looks interesting
Network West Midlands - Tram or National Express Midland Metro - Birmingham Trams
Stagecoach Supertram: home - Sheffield Trams
Every Journey Matters - Transport for London - TfL
How to start with Qt? | nidomiro - a good introduction
C++ Qt Programming - YouTube - some introduction videos
Alexa Top 500 Global Sites - most popular websites
Have I been pwned? Check if your email has been compromised in a data breach - "haveibeenpwned" is run by Troy Hunt, security researcher, so can be trusted
General Data Protection Regulation (GDPR) – Final text neatly arranged - for the full GDPR documentation
Tower Bridge | London’s Famous Bridges | London Landmarks
Stay safe in London | The Met
Theft tactics: Be Aware of thieves' tactics | British Transport Police
Godot Engine - Free and open source 2D and 3D game engine
Home | mRemoteNG - colleagues have used this, looks worth trying
Remote Desktop Manager - Remote connection and password management software - installed on client's machines, commercial product, possibly worth a look
Picture Sheffield - Images of Sheffield from the council archive
Northern Powergrid | Power Cuts - check if you have an electrical power cut in Sheffield, Yorkshire or the North East
BMI healthy weight calculator - Health tools - NHS Choices
Julian Treasure: How to speak so that people want to listen | TED Talk
Quod Libet is written in Python and uses a Python library for manipulating audio file metadata, specifically the tags, see Overview — mutagen for details.
I have used Hiren's Boot CD in the past, not really sure where to get it from now, possibly Hiren's BootCD PE but maybe Hiren's BootCD 15.2 - All in one Bootable CD » www.hiren.info.
The following sites might be useful for solutions you are building:
Specifically COVID-19
If you are considering using any kind of financial service, so banking, insurance, pension, investments then go to FCA Firm Checker | FCA and check if they are authorised to do what you want by the Financial Conduct Authority.