• Chemical substance – Matter of constant chemical composition and properties
• Inorganic compounds by element
• List of alloys
• List of alkanes
• List of elements by name
• List of minerals – List of minerals with Wikipedia articles
• List of alchemical substances
• Polyatomic ion – Ion containing two or more atoms
• Exotic molecules – Atoms composed of exotic particles can form compounds

Relevant links for chemical compounds are:

• The CAS Substance Databases
• Common Chemistry
• ChemSpider
• PubChem