If you click a link, the file will download immediately.
You can download for free and modify the files, if you like, with a HTML editor.
If you want to download the app to use it offline then open the file by clicking it from your file explorer or choose 'open with: browser' from the menu after rightclicking.
The apps can be visited online on a separated page by clicking on the links below: /currency, https://climatedata.online: coordinates, metropolis, Provinces of Belgium, /game, /1x1, /Igbo, klikopde.link