This information may help researchers to develop a robust human-computer interaction system which could be focused on the interfaces between people (users) and computers.
In my past I';ve actually made fully interactive prototypes, without code backing, using Powerpoint. These can be using for usability testing scenarios for designs ( not responsive) showing a static size web page, they can be used to mimic smaller form-factors (phones) too. While it's not free, I expect you already have a licence. It has animations and can be set-up with internal hyperlinks made to look whatever level of visual fidelity you want
The best routes for "free" are to use your office tools creatively, or the 'month' free trials many services offer. You could also try phoning the supplier and talking to them about other ways of their getting recompess for your being given a license- case studies etc
Yogesh Kumar Meena typically I do not use open-source, I work for organisations that pay for subscriptions to professional tools with IT cyber security approval - I prefer these because they are used by everyone and therefore support cooperative working on design development. People in smaller organisations might be more well informed about open source tools
If you are looking for clickable (mobile) prototyping, I used a programm/app that is called Marvel App (https://marvelapp.com/features/prototyping). It was free to make a clickable prototype using the programm and the app on a mobile device, however your screens must be finalized before you can use them to create the clickable functionality. That can be done in another program (Powerpoint, PS, Illustrator, InvisionApp ...or whatever you prefer) or partly in marvelApp. I think it also supports wireframing etc. but that might cost something.
Renée Schulz thanks for an answer! Yes there is some costs for designing a prototype. But it looks good to me, will consider this for future designing!
You might try figma. its free for limited collaboration use and supports clickable workflows for limited branching in your workflow. It has a desktop and cloud version which sync your work together when offline and online.
I tried many prototyping tools in the past - my favorite so far is Sketch + Flinto. I love the pipeline between both tools which makes the prototyping process very convenient. Also Flinto offers great conditional options and plenty of micro-animation and transition possibilities. They also feature a iOS preview app (maybe Android as well).
Glenn Osga thanks for an answer! Do you know if any manual/ppt/lecture notes/videos are available for new users, specifically how researchers can structure there files in Figma easily?