Chemistry runs on software — for drawing structures, processing spectra, plotting data, modeling molecules, and managing literature. Almost all of the major tools (ChemDraw, OriginPro, MestReNova, ChemDoodle) are sold through direct licenses or institutional subscriptions, not retail stores or app marketplaces, which is exactly why “free download” searches for them are so common. This guide is the honest map: how to access each tool legally — often for free through your university — and which open-source or freeware alternatives are good enough for coursework, theses, and even published research. Here is our Chemistry Software Guide:

Compiled and maintained by an active researcher who has used most of these tools directly in research and teaching. We update this page as software and licensing terms change.

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1. Chemical structure drawing

Full breakdown, legal access routes, and step-by-step setup: How to Get ChemDraw Legally + 6 Free Alternatives →

2. NMR processing software

MestReNova (MNova) is the most widely used NMR processing package in academic and industrial labs, and its interface is generally preferred for publication-quality figures. It is not free, but two routes make it (or an equivalent) accessible at no cost:

• NMRbox — a free, cloud-based virtual Linux environment (via a free academic login) that includes a free version of MNova alongside 40+ other NMR processing programs, including NMRPipe.
• Bruker TopSpin — free for academic users directly from Bruker; also handles acquisition and includes a “classroom edition” of the CMC-se structure elucidation module.
• SpinWorks — free, Windows-based 1D/2D processing tool from the University of Manitoba; a solid choice if you just need routine spectra processed without an academic login.

ChemDraw’s built-in H-1/C-13 NMR prediction (see the ChemDraw guide above) is useful for predicting expected shifts before you even run the experiment.

3. Data plotting and analysis (OriginPro alternatives)

OriginPro remains the standard for curve fitting and publication graphs in many chemistry departments, but it is Windows-only and licensed per seat. If your department has a site license, use it — otherwise:

• SciDAVis — free, open-source, deliberately modeled on Origin’s interface; imports ASCII, CSV, and Excel data directly, so the learning curve from Origin is short.
• LabPlot — free, cross-platform (KDE project); strong file-format support (including SPSS/Stata/MATLAB imports), LaTeX-formatted labels, and solid curve fitting.
• Veusz — free, scriptable via Python; excellent for publication-ready 2D/3D plots and automated, repeatable figure generation.
• Python (Matplotlib) or R — the most powerful long-term option if you’re willing to learn a little code; nearly everything OriginPro can do, plus full reproducibility, which more journals now expect (a shareable script instead of a locked project file).

4. Molecular visualization and modeling

Unlike drawing and plotting tools, the best molecular visualization software is free even at the professional research level:

• Avogadro — free, open-source molecule editor and 3D visualizer; widely used in computational chemistry, molecular modeling, and teaching. Pulls structures directly from PubChem and the Protein Data Bank.
• PyMOL — free, open-source core (a paid “Incentive PyMOL” build adds an easier Windows installer and support); the standard for visualizing protein, DNA/RNA, and crystal structures.
• Jmol — free, Java-based, browser-embeddable; common in teaching materials and IB/A-Level chemistry coursework for visualizing molecular geometry and electrostatic potential.
• IQmol — free, lightweight, pairs well with computational chemistry input/output files.

5. Computational chemistry (free and open-source)

If you’re moving into quantum chemistry or molecular modeling, you don’t need a paid package to start:

• Psi4 and NWChem — free, open-source ab initio quantum chemistry codes used in published research
• ORCA — free for academic use; widely used for DFT calculations
• Avogadro (above) doubles as an input-file builder and output visualizer for all three

6. Reference and citation managers

For managing literature and citations, the free tier is genuinely the right choice for most students and researchers, not just a budget compromise:

• Zotero — free, open-source, unlimited local storage, strong Google Docs integration, and the largest plugin ecosystem; the default recommendation for most researchers without an institutional EndNote mandate.
• Mendeley — free tier includes 2 GB cloud storage and a built-in PDF reader/annotator; owned by Elsevier, with tighter integration into their publishing ecosystem.
• JabRef — free, open-source, the strongest option if you write in LaTeX.

EndNote remains common at institutions that pay for site licenses, but for personal use, Zotero covers citation management for free with no meaningful loss of function for most workflows.

7. Free chemistry databases and spectral libraries

These aren’t “alternatives” to paid software — they’re free, official resources every chemist should bookmark:

• PubChem (NIH) — free compound, structure, and bioactivity database
• NIST Chemistry WebBook — free thermochemical, spectral, and reaction data
• SDBS (Spectral Database for Organic Compounds, AIST Japan) — free IR, NMR, MS, and Raman spectra for thousands of compounds
• ChemSpider (RSC) — free structure search across 100M+ compounds
• Reaxys / SciFinder — not free, but many universities provide institutional access; check your library first before assuming you need a personal subscription

Our recommendation by user type

Related guides

• ChemDraw Pro 8.0: Legal Access + Free Alternatives
• ChemDraw Ultra 12.0: Legal Access + Free Alternatives
• OriginPro: Legal Access + Free Alternatives
• How to Draw Publication-Quality Chemical Structures — InfoChemist
• Student research skills resources — UOCS

Have a chemistry software question this guide doesn’t cover, or a tool you’d like us to test? Let us know in the comments — we update this page regularly.

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