These resources provide not only information on an extensive array of reactions, but also powerful structure based searching interfaces for reaction discovery and synthesis planning. For comprehensive reaction searching, you may need to search each of these databases, as well as consulting online handbooks of reaction information and print reference works on synthetic methods.
Information on reagents, solvents, and more to help with your synthesis planning.
These are links to download software for drawing chemical structures. Resulting structures can be saved in a variety of formats for use in structure searchable databases, word processing documents, etc.