Zotero is a free and open source bibliography manager that allows you to create your own personal database by importing references from databases and the web. Zotero can help you format citations for a reference list, insert proper citations in documents, save article information (including PDFs), and maintain a record of sources you have consulted.
Tropy is a free and open source application designed to help you take control of your research photos, a tool that shortens the path from finding archival sources to writing about them. Spend more time using your research photos, and less time searching for them. Tropy allows you to organize photographs of archival material, tag and group items, annotate photos, organize notes, and search across your collections.