Libre Office is a free and extremely credible alternative to Microsoft Office.
GIMP is a very feature rich piece of free open-source photo and image editing software.
Audacity is powerful open source software for recording and editing sound.
VLC Media Player is free open-source software which can handle pretty much any video or audio format you throw at it.
DaVinci Resolve offers professional quality non-linear video editing. The free version offers more than enough tools for the non-professional video editor.
Studio One Prime by PreSonus is excellent free Digitial Audio Workstation (DAW) software.
Adobe Acrobat Reader is used to read PDF files. It is quite likely that Acrobat Reader is already installed on your computer, but if you are receiving emails with PDF attachments that you cannot open then installing it will probably resolve the issue.
HandBrake is a very useful free video transcoding application. Although it does include some extremely basic editing tools, its main function is converting video files from one format to another. For example, if you have a video from your phone that you can’t view on your computer or iPad, then Handbrake is the tool you need.
Dropbox is not so much a piece of software as a very useful service along the same lines as Microsoft OneDrive, Apple iCloud or Google Drive. Dropbox's free plan offers two gigabytes of free online storage to save and share files as you see fit. There are also paid subscription plans if you need more storage. Using the dropbox application will let you automatically synchronise files across multiple computers, tablets and smartphones. It also provides a very easy method of getting the photos and videos on your smartphone onto your computer. Finally, it also offers an easy method of sharing data with your friends without having to email huge attachments. Sounds complicated, but it’s much easier to use than you might think!
ActionFraud is the UK's national fraud and internet crime reporting centre. If you have been the victim of fraud or attempted fraud, either online, by email or on the phone this is the place to report it.
Internet Watch Foundation is the place to go to report illegal online content and images of abuse.
ThinkUKnow operated by CEOP and aimed at both children and parents/carers, this site offers useful advice about staying safe online. The content is broken into categories based on the age of the viewer.
Family Online Safety Institute is an organisation that exists to promote best practices amongst ISPs and other corporate bodies. The site contains some interesting information.