The Cambridge Structural Database (CSD), maintained by the Cambridge Crystallographic Data Centre, is the largest curated crystal structure database. It supports structural chemistry research across fields including drug discovery, solid form analysis, and functional materials design, with associated software tools for searching, analysing, and working with crystal structure data. The platform also offers community resources, training support, and data deposit services.
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CamelCamelCamel is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
CameronsWorld is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
Campus FM is an audio or music resource for streaming, discovery, editing, production, or library management.
CancerFactFinder is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
CandidateChecker is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
Candle helps discover apps, SaaS products, no-signup tools, clones, or software alternatives.
Canna is an audio or music resource for streaming, discovery, editing, production, or library management.
CannaPower is an audio or music resource for streaming, discovery, editing, production, or library management.
CarComplaints is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
Career Dreamer is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
CareerVault is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
Cars.com is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
CarSized is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
CartoArt helps discover apps, SaaS products, no-signup tools, clones, or software alternatives.
Cataas is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
CDC is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
CellMapper helps discover apps, SaaS products, no-signup tools, clones, or software alternatives.
Censys provides a map of the internet that security teams use to defend attack surfaces and hunt for threats. It offers security operations and exposure management with real-time internet intelligence. Products listed include attack surface management, Censys Search and adversary investigation.
Czech central archival information system.
CertKit Certificate Search is a tool that searches TLS certificate transparency logs to locate publicly issued certificates. It can identify new subdomains, certificate renewals, and suspicious activity, supporting security monitoring, domain research, and uncovering hidden infrastructure.
CGDirector is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
An awesome list of low- and no-code generative AI resources, organized into categories such as products and tools, prompt design, visual tools, writing, content, and learning materials. The repository holds a README and includes a CC0-1.0 license, a code of conduct, and contributing guidelines.
CharityNavigator is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.