MIT CommKit – Communications guide from the Broad institute
iBiology – Instructive videos on different areas in biology.
Keep Science Going – A resource for online tutorials and webinars for home office.
Nature Online Resources
The PhD collection – Articles for future and current PhD students.
Scientific data collection – Articles on scientific data, collaboration and publishing.
Mentoring collection – Articles with advice for (future) mentors and mentees.
Science careers and mental health collection – Articles with a focus on mental health for PhD students and scientists in general.
Nature Masterclasses – Next to paid content also free resources, e.g. on Peer Review.
Comic relief: xkcd If things stop working altogether.