PDFescape - a free and easy PDF document editor. You can use this for your 3 rounds of reflections on the RPPF and to have your supervisor sign it. Be careful with the naming of your documents so you know which is your most recent!
DOAJ - Directory of Open Access Journals - You probably want to search articles, not for entire journals (2 tick options under search box) or click on Advanced Search. Be specific! No login needed.
ResearchGate - a site for researchers to share their papers and collaborate, but openly searchable by anyone! No login needed.
Google Scholar - No login needed to search, but beware: many of the articles have only the synopsis or abstract available, and you have to go to a paid or subscription database to get the full article.