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Simplified molecular-input line-entry system (SMILES)

Search Google for molecules  (generates InChI from interactive chemical and searches Google for any pages with embedded InChIs). Requires Javascript enabled on browser

ChemSketch , free chemical structure drawing package that includes input and output in InCHI format

PubChem online molecule editor that supports SMILES/SMARTS and InChI

ChemSpider Services that allows generation of InChI and conversion of InChI to structure (also SMILES and generation of other properties)

MarvinSketch  from ChemAxon, implementation to draw structures (or open other file formats) and output to InChI file format

BKchem  implements its own InChI parser and uses the IUPAC implementation to generate InChI strings

CompoundSearch implements an InChI and InChI Key search of spectral libraries

JNI-InChI Java library that wraps the InChI library

the Chemistry Development Kit uses JNI-InChI to generate InChIs, can convert InChIs into structures, and generate tautomers based on the InChI algorithms

Bioclipse generates InChI and InChIKeys for drawn structures or opened files