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When you write a scientific report, you will usually start by reading a lot of literature, taking notes, and organizing these notes into a structure of chapters and sections. This can obviously be done in a word processor (e.g., LaTeX, LibreOffice, AbiWord, or Microsoft Word), but it is often more efficient to use a specific tool for this purpose. An excellent and free example of such a tool is Evernote. This tool has a lot of nice features and is available for many types of computers and mobile phones.
There are many alternatives to Evernote, but this program meets my requirements.
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Zotero is a plugin to the Firefox browser that can be used to record and manage references. Zotero is also available as a stand-alone tool for most other browsers. When you search for literature in, for example, Amazon, ScienceDirect or , or Google Scholar, and find something of interest, you just click the Zotero icon in Firefox - and then the reference is properly recorded. You may afterwards edit and add notes to the references, and group them into sub-libraries. If you are using LaTeX, you can easily export the Zotero references in bib-format to be used with BibTeX - a very efficient tool!