Tools for efficient and effective research

I can recommend the following research tools to students and practitioners.

Literature databases

Online statistic pages

Electronic Statistics Textbook (StatSoft)
Internet-Lexikon der Methoden der empirischen Sozialforschung (ILMES)

Software tools that I use and recommend
Citavi, Endnote or Mendeley (because they make academic life so much easier)
Dropbox (for filesharing in distributed projects)
Publish or Perish (to search more systematically in Google Scholar)
Trello (project management for multiple users)
Personal Backup (for continous data backups)
Challenger (to encrypt data safely and easily)