"On Being a Scientist", A short guide to the responsible conduct of research (a free pdf is available at the link after registration);
NIH Research Ethics Course, a brief (~1 hr) online course that covers the basics of research ethics such as data acquisition and management, publication and authorship, etc.;
"Who Are Corresponding Authors?" editorial by P. S. Weiss, ACS Nano, 2012, 6, 4, 2861;
CRediT - Contributor Roles Taxonomy, a taxonomy to assist with assigning author contributions in multi-author publications;
GISAXS guide and tutorials on grazing incidence diffraction by Dr. Detlef-M. Smilgies. Thoroughly referenced materials with a lot of examples;
ImageJ and/or Fiji (I use it for analysis of transmission electron microscopy images of nanoparticles. For the description of the "thresholding method" of size determination using ImageJ see paper 1, and for the detailed examination of the method see paper 2 (open access));
Feedly (RSS feed reader, I use it to keep up with the latest published articles in ACS, RSC, Wiley, etc.);
WebPlotDigitizer (a tool to extract numerical data from the images of plots, thanks to Mike Brennan for pointing it out);
EndNote (been using this reference manager since undergrad, it's not free but worth investment if you write your manuscripts and proposals in MS Word);
NotePad++ (extremely versatile notepad software);
Grammarly (As a non-native English speaker I find this software indispensable for proof-reading of the written text);
UltraSearch by JamSoftware (to quickly find anything on your PC);
Spectragryph software for opening spectra in manufacturer's file formats (e.g., *.dsw from Cary spectrometers, *.fs from Edinburgh Instruments, and so on), their motto "Free your spectral data from the spectrometer system. View & work your data wherever you want.";
ProfilmOnline is a web-based application for surface imaging and analysis. The application supports a large variety of file formats from different profilometers and instruments and is straightforward to use.
"The Craft of Science Writing" edited by Siri Carpenter, collection of very engaging pieces of scientific journalism and how to write about science;
"Academic English: Writing" Coursera online course from University of California Irvine. I took parts of it when I was writing my Ph.D. thesis and can recommend it to anyone wanting to improve their writing skills;
"Grammarly" is an indispensable proof-reading service;
Another example of successful ERC Starting Grant Proposal by Franco Vazza;
Marie Curie Fellows Network (a Facebook group for connecting with other MSCA fellows and applicants for sharing questions and discussions about anything related to MSCA);
Build-your-own website for scientists (11 May 2020, NatureIndex.com);
Use your lab website to make a compelling first impression (4 May 2020, Nature);
Crystallography and Structure
"Crystallography: A Very Short Introduction" by Mike Glazer. An informative and entertaining combination of historical account and a crash course.
"Resources for Crystallographic Education" from the International Union of Crystallography;
"Lattice versus structure, dimensionality versus periodicity: a crystallographic Babel?" by Massimo Nespolo, J. Appl. Cryst. 2019, 52, 451-456 (Open Access). An article on the correct use of crystallographic terminology in scientific writing, e.g., lattice vs. structure.
"What Defines a Perovskite?" by Joachim Breternitz and Susan Schorr, Adv. Energy Mater. 2018, 8, 1802366 (Open Access);
"What Defines a Halide Perovskite?" by Quinten Akkerman and Liberato Manna, ACS Energy Lett. 2020, 5, 604–610 (Open Access);
Online Seminar Series
A non-exhaustive list of regular chemistry/nano-related webinars to sustain independent learning:
Motivation and Resilience
A partial list of resources that I turn to for inspiration and grit.