By chemical database software I mean software with similar functionalities to Instant JChem in that they have a large database of different compounds and have the basic capabilities you, or at least I expect from a chemistry software. Namely:
- Can approximate the chemical and physical characteristics of the compounds in question.
- Can approximate products of reactants and their corresponding proportions.
- Can show the 2d and 3d structure of compounds in the database.
- Can connect to online chemical databases like PubChem, ChemSpider, NCBI, etc.
- Has a molecule editor.
I would also prefer it if it is free of charge.