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The W3C Markup Validation Service is a service based on SGML and XML parsers that checks the markup validity of Web documents, including HTML, XHTML, SMIL and MathML. Documents can be checked by URI, file upload or direct input. An experimental web service API is documented, along with a user's guide and explanations of error messages.
Cerberus is a lightweight and extensible data validation library for Python. It provides type checking and other base functionality out of the box, is designed to be non-blocking and extensible for custom validation, and has no dependencies. It is available on PyPI and maintained according to semantic versioning since version 1.2.
AI agents that act as your personal venture analyst - from startup idea brainstorming to full validation and go-to-market strategy. Built for developers who'd rather validate in 10 minutes than regret in six months. Powered by Claude Code, OpenAI Codex, and Cursor.
Accord.MachineLearning is a NuGet package, part of the Accord.NET Framework, that contains Support Vector Machines, Decision Trees, Naive Bayesian models, K-means, Gaussian Mixture models, and general algorithms such as Ransac, Cross-validation and Grid-Search for machine-learning applications. Version 3.8.0 targets .NET Standard 1.4 and .NET Framework 3.5.
AI Models Catalog is a structured YAML catalog of AI model providers and their models, sourced from first-party APIs and official documentation. It includes TypeScript type definitions and Zod runtime validation schemas, plus scripts to sync data from providers and validate YAML files against schemas.
Algorithms Books presents three textbooks by Mykel J. Kochenderfer and coauthors, published by the MIT Press. The books are Algorithms for Optimization, Algorithms for Decision Making, and Algorithms for Validation. Full PDFs are available free.
AVISO+ is a satellite altimetry data service providing sea surface height, value-added, wind/wave, auxiliary, ice and ocean indicator products. It offers data access, user handbooks, format and licence information, calibration/validation resources, and open-source Python tools for exploring and downloading SWOT altimetry data. It also covers altimetry missions, techniques and applications.
BOLD, the Barcode of Life Data Systems, is a data portal for identifying species through DNA barcodes. It provides access to over 21.1m public records representing 1.7m species, with the remaining records awaiting validation and release. BOLDv5 has a redesigned layout, while BOLDv4 remains accessible at v4.boldsystems.org.
Blocklist is a privacy DNS service at tiar.app offering DNS resolution over DNS, DNSCrypt, DoH/DoH3, DoQ and DoT. It filters ads, ad-tracking and malware, and states DNSSEC validation, no EDNS Client Subnet and no logs. It is published on GitHub under an MIT license.
The Community Coordinated Modeling Center is a multi-agency partnership at NASA Goddard Space Flight Center that supports research and development for space science and space weather models. It provides free access to research models through an automated model run system, along with online visualization and analysis tools, model validation, forecasting support, and education resources.
A page from the Fake Name Generator that checks a credit card number's network, length and Luhn check digit. It explains the Luhn check step by step and offers sample made-up numbers for testing forms. The page notes the sample numbers are not accounts and are declined by payment gateways.
Deepchecks is an open-source project for validating machine learning models and data from research to production. It includes built-in and custom checks and suites for tabular, NLP and CV validation, CI and testing management, and monitoring of deployed models. Installation is via pip.
Dr. Link Check is a broken link checker that crawls a website from a start URL through its HTML and CSS, examining internal and outbound links plus links to images, style sheets, and other resource files. Each link passes multiple checks, including URL validation, DNS lookup, connect check, SSL certificate check, and HTTP response check. Results can be sorted, filtered, and exported to CSV.
Email Dossier is a validation tool that checks an email address by walking through the process of sending email without actually sending any. It checks address syntax, looks up the domain's mail servers and tries contacting them. It reports a confidence rating from 0 to 3, error codes, a canonical address and MX records.
Hunter tool for verifying if an email address is valid, deliverable, and safe to use before outreach.
A global resource for 3D electron microscopy structure data, covering archiving and retrieval of structures along with news, events, software tools, data standards and validation methods. It reports recent EMDB map entries and PDB coordinate entries.
emudev.org is a network of people interested in documenting, emulating, simulating and re-implementing hardware near extinction. Its stated purpose is preserving platforms designed or used for gaming and other artistic endeavors. Goals include publishing standardized hardware documentation, tests and validation suites, and reference software and hardware cores. All information, source code and designs are made available at no cost under liberal licenses.
Eurybia is an open-source tool hosted on GitHub under the MAIF organization. It is designed to monitor model drift over time and secure model deployment processes through data validation functionality, with public documentation covering overview, quickstart, installation, features, and project background.
EvalML is an AutoML library written in Python that builds, optimizes, and evaluates machine learning pipelines using domain-specific objective functions. It includes data quality checks, cross-validation, preprocessing, feature engineering, feature selection, and model understanding tools. Install from PyPI or conda-forge.
Forefront is described as a platform to fine-tune and inference open-source language models. The site mentions building with open-source AI, fine-tuning models on data, and running inference through serverless API endpoints. It also describes storing training, validation and evaluation data in ready-to-fine-tune datasets. Pricing lists a free tier and a team plan at $99 per month, each including $20 in free credits.
Intelligence X is a provider of free open source intelligence (OSINT) and forensic tools for investigations. Its toolset supports search across third-party sites, social media intelligence for Facebook, Twitter, LinkedIn, Telegram, and YouTube, and utilities for tasks including email validation, domain lookups, IP lookups, Bitcoin tracing, and image analysis. All listed OSINT and forensic tools are available to use at no cost.
The ISRCTN registry is a clinical study registry recognised by the WHO and ICMJE that accepts proposed, ongoing and completed clinical research studies. It provides content validation, curation and unique identification numbers needed for publication, and all study records are freely accessible and searchable. Registration is ideally prospective, though retrospective registration is accepted.
LIBSVM is an integrated software library for support vector classification, regression and distribution estimation. It provides a simple interface for linking with other programs and includes multi-class classification, cross-validation and probability estimates. Interfaces exist for Python, R, MATLAB and other languages.
MLU-Explain is an education initiative from Amazon that teaches machine learning concepts through visual essays. It publishes interactive articles on topics such as neural networks, logistic regression, reinforcement learning, ROC and AUC, cross-validation, random forests, and decision trees.
