Slicer does not need installation, just a computer. So, if you put Slicer and some data sets in a dropbox folder and share it with others then they can start Slicer from that folder without installing. You can also give users access to a Slicer computer that has some data preloaded using remote desktop sharing. The advantage of these solutions that you have access to all Slicer visualization, processing, and analysis features.
If you want to open the files from a phone or Android/iOS tablet and simple viewing is enough then you have many options:
A. If you don’t need your users to make measurements then often 3D rotation video (exported by Screen Capture module) is sufficient.
B. If you want to send a file in an email:
- B1. Use any 3D web viewer that supports glTF. For example, you can open 3dviewer.net in the browser on your phone/tablet and open the file that you downloaded (e.g., from an email). This viewer is very nice in that you can see the model hierarchy and turn on/off visibility of each segment.
- B2. Install a glTF viewer app, such as CAD Assistant. When you open the attachment in the email app, it will offer to open the 3D model in the installed viewer app. This is convenient, but unfortunately I could not find any 3D viewer that would work as well as 3dviewer.net.
C. If you don’t want to send a file in email then you can upload to anywhere (such as dropbox, or any other server that you trust, it can be a computer within your hospital, too) and generate a direct link that opens the file in a web viewer in your browser. Only the viewer is downloaded from the viewer’s server, your model is not uploaded there. See more details here about how to create viewer link.