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A Matlab package implementing machine learning algorithms described in the textbook Pattern Recognition and Machine Learning by C. Bishop. It is written purely in Matlab and is self-contained with no external dependency.
PDFEncrypt is a free, open-source native Windows app that encrypts PDF files using standard PDF encryption algorithms. Users specify a password required to open the document along with options and permissions for the PDF. Encryption runs locally on the Windows PC rather than uploading files to a third-party server. The app uses the iTextPDF library and is released under the AGPL license.
Perfectly Imperfect (PI.FYI) is a social magazine platform where users share personal recommendations for food, music, books, films, places and other interests. Content is curated by real people instead of algorithms, and the platform features editorial content and interviews with public figures, with all past content stored in a searchable archive. Users can create custom lists, share their own recommendations, theme their profiles and connect with others over shared interests.
Perspec is a scriptable desktop app to correct the perspective of images, such as photos of whiteboards, document scans, or facades. Its integrated computer vision algorithms automatically detect document corners, which can be manually adjusted if incorrect. Corrected images can be saved in several color modes. It is also usable via a command line interface.
Machine Learning library for PHP. Algorithms, Cross Validation, Neural Network, Preprocessing, Feature Extraction and much more in one library.
Browser-based tool that scales pixel art images to larger or smaller sizes without blurring. It offers several pixel art scaling algorithms, including cleanEdge, hqx and xBR, and processes images locally without uploading them. Animated GIFs are not supported; only the first frame is scaled.
Project Naptha is a browser-based tool that applies computer vision algorithms to images on web pages so text inside them can be highlighted, copied, edited and translated. The project page is a live demo showing text selection over words in an image. It was made by Kevin Kwok and Guillermo Webster.
RawTherapee is a free, cross-platform raw image processing program released as Free Software under GPLv3. It is designed for developing raw files from a broad range of digital cameras and offers a non-destructive, 32-bit floating point processing engine with modern demosaicing algorithms. It is available for Linux, macOS, and Windows and in over 15 languages.
Red Blob Games publishes interactive visual explanations of math and algorithms, using examples from computer games and other projects. Topics include pathfinding, map generation from noise, hexagonal grids, Voronoi diagrams, graph theory and 2D visibility. Articles are free, with no signup and no ads, aimed mainly at independent, student and hobbyist software developers. The site also hosts demos such as map generators.
Basic sampling algorithms for Julia.
A tutorial project for applying machine learning in Python with scikit-learn, a Python module built on numpy and scipy. It aims to teach practical application of scikit-learn algorithms; the stated audience is experienced Python developers familiar with numpy and scipy. Prebuilt PDF and HTML versions, tutorial source and exercise solutions are available, and the material is under a Creative Commons Attribution 3.0 license.
Siril is an astronomical image processing tool. It supports preprocessing steps such as calibration, stacking and enhancement, and tools for analyzing star brightness variation and astrometry. It can process SER videos and FITS cubes, and algorithms run on all computer cores. Versions are offered for Linux, Windows and macOS.
SpeedCubeDB is a free online speedcubing algorithm and reconstruction database. It covers algorithms for 2x2 through 6x6 cubes as well as Square 1, Pyraminx, Megaminx, and Skewb. The site also lists practice tools including a scramble analyzer and cross trainer, and offers login for tracking progress.
Spinning Up is OpenAI's educational resource on deep reinforcement learning. Its documentation covers installation, included algorithms, running experiments, and an introduction to RL, along with algorithm pages for methods such as DDPG and PPO. The DDPG page describes an algorithm that concurrently learns a Q-function and a policy for continuous action spaces. The PPO page describes on-policy first-order methods, including PPO-Clip.
Stan is software for Bayesian data analysis that combines statistical modeling capabilities with user-friendly interfaces and open-source development. Its probabilistic programming language supports applications from simple linear regression to multi-level models and time-series analysis. Interfaces exist for Python, Julia, R, and the Unix shell, usable on laptops, clusters, or in the cloud. Official documentation covers the language, inference algorithms, and built-in functions.
StudyForrest is a dataset collection built around the movie Forrest Gump, providing reproducible complex sensory input for brain research. It includes fMRI scans, structural brain scans, eye-tracking data and extensive annotations of the movie. The project offers reference datasets for benchmarking brain imaging algorithms and for studying cognition under natural stimulation.
Surprise is a Python scikit for building and analyzing recommender systems that deal with explicit rating data. It includes built-in datasets, prediction algorithms such as SVD and NMF, similarity measures, and cross-validation tools. The documentation states that Surprise does not support implicit ratings or content-based information.
TeraCopy is a Windows utility that replaces Explorer's copy and move functions. It can verify copied files with checksum algorithms, skip problematic files instead of terminating a transfer, and wait for network or device reconnection. It supports task queuing, transfer history, and metadata configuration.
An online tool that calculates checksums of ASCII or Unicode text and of files up to 5MB, using a list of hash algorithms including MD5, SHA1, SHA256 and SHA512. It states that checksums are commonly used to verify data integrity, such as confirming a downloaded file is error-free.
Tofu is an open-source two-factor authentication app for iOS. It generates one-time passwords using the HOTP and TOTP algorithms with 6 or 8 digits, requires no network connection, and stores account details in the iOS keychain. The source code is available on GitHub under the ISC license.
Toyota Technological Institute at Chicago is a philanthropically endowed computer science graduate institute. Its research areas include algorithms and complexity, computational biology, computer vision, machine learning, robotics, and speech and language. The institute offers a PhD program.
Tune is a Python library for experiment execution and hyperparameter tuning at any scale. It supports machine learning frameworks including PyTorch, XGBoost, and TensorFlow and Keras, and runs algorithms such as Population Based Training (PBT) and HyperBand/ASHA. It also integrates with hyperparameter optimization tools including Ax, BayesOpt, BOHB, Nevergrad, and Optuna.
Universal Encoding Tool is a web-based utility that offers methods for encoding, decoding, encryption, decryption, conversion and hashing. It covers simple conversions between ASCII, binary, hex, decimal and Roman numerals, along with network tools for IP and IPv6. Non-key encoding methods, HTML entities, URL encoding, hash algorithms, key-based encryption ciphers, Unix time conversion and IBAN validation are also listed.
VocalRemover is a free online application that separates a song into a karaoke version without vocals and an acapella version with isolated vocals. It uses artificial intelligence algorithms and processing usually takes about 10 seconds.
