- American Elements
- Chemical Synthesis Database
- ChemWeb.com
- Classic organic reactions by ChemPen
- Commercial Sites
- Common Reactive Intermediates in Organic Synthesis
- Do You Want to Succeed in Organic Chemistry
- Evans Group’s synthetic Problems
- Fukuyama Group’s Synthesis Problems
- How to Get Good Marks in Organic Chemistry
- Learning Organic Chemistry
- Master Organic Chemistry
- Named Reaction List by Marcus Brackeen
- Named Reactions
- NIST Chemistry WebBook
- Organic Chemistry Practice Problems
- Organic Reaction Quizzes and Summaries
- Organic Synthesis
- Periodic Table of Elements
- Polymer Search
- Problems in NMR and IR spectroscopy