EU RESPECT guidelines (including potential dilemmas that may arise for researchers).
Ethics in research with children
Ethical Research Involving Children (ERIC) — site with best practices, case studies, issues, reflections on conducting ethical research with children (including internationally).
Ethics and the use of social media data
Ethics and collecting data through crowdsourcing
Ethics and collecting fieldwork data
The San Code of Research Ethics. A set of ethical guidelines created by research subjects for researchers. Sponsored by the EU Trust, a project dedicated to supporting ethical research with vulnerable populations.
Ethics of data sharing
Ethical considerations for deaf populations