ChemDraw is described as 'Communication suite for managing, reporting and presenting Chemistry research. Produce precise chemical structures with our premier chemical drawing solution' and is an app in the education & reference category. There are more than 10 alternatives to ChemDraw for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best ChemDraw alternative is Chemaxon Marvin, which is free. Other great apps like ChemDraw are ChemDoodle, ACD/ChemSketch, MedChem Designer and JChemPaint.
The Gnome Chemistry Utils include six chemistry related programs:
Cool Chemistry Tool - educational app for Students. Chemist will help you in chemical tasks! Use the Periodic Table just like a computer keyboard. With the Chemist you will learn everything you need to know about the elements, compounds and chemical reactions.
because chemdraw is intended for drawing chemical structures, while chemik isn't
It is not possible to draw chemical structures
This alternative is disputed. Chemik is a legitimate ChemDraw alternative, but it might have issues that some users think are important.
MollyCule is a completely free Open Source Chemistry visualisation program for MacOS, Linux and Windows. MollyCule is designed to be a nice, easy to use program to help ordinary people who want to explore Chemistry.
ChemApp is a powerful tool that will help you to solve everything from the simplest to the most complex of chemistry problems - from balancing chemical reactions and finding molar masses to solving reaction stoichiometry problems.
speciolab is a modern yet easy-to-use chemical drawing software that is aimed at helping students, companies and other users to draw clean and orderly chemical structures for reports, theses and presentations.
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ChemDraw is specifically intended for drawing chemical structures to include in documents, presentations and beyond. Chemik is specifically not intended for that and therefore can't be a replacement. (Also, the Chemik website has an explainer Youtube video which is blocked in Denmark on copyright grounds - very useful!)