Open source projects I use all the time:
Whether for tutorials, editing images or manuscripts, there are open source projects that can help a scientist get a lot done for free. Not everything – I bought the Corel Videostudio software I use to edit the Vlog. I use Microsoft Office for various reasons. But when I can, I prefer to use an open alternative. Both because I am cheap and because I feel like it’s making the software ecosystem more open and accountable.
Dr. Peter's Lab Notebook 