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Simple Image Resizer is an online tool for resizing JPG, PNG, WEBP and HEIC images for social media, email or websites without installations. A premium plan offers ad-free use and batch processing of up to 25 images at once, billed monthly at $2.99 or annually at $19.99.
Email alias service for creating forwarding addresses that protect your real inbox.
SimpleCV is an open source framework for building computer vision applications, providing access to libraries such as OpenCV without requiring knowledge of bit depths, file formats, color spaces or buffer management. The platform uses Python, and examples include connecting to a camera, binarizing images and drawing text.
SimpleDiscordCrypt is a code project with source, releases, documentation, or setup notes.
Simplex Chat is a code project with source, releases, documentation, or setup notes.
sing-box is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.
sing-box is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.
Apache SINGA is an Apache Top Level Project focused on distributed training of deep learning and machine learning models. It supports data parallel training across multiple GPUs on a single node or across different nodes, automatic gradient calculation, and loading and saving ONNX format models. Models trained with SINGA can be queried as stored procedures in an RDBMS.
data.gov.sg is Singapore's open data platform, intended to make data discoverable, understandable and usable. It provides free access to interactive charts and maps for national datasets and offers APIs for development. The portal is described as holding 4,500+ datasets from 70+ government agencies, with options to explore and embed live charts and tables and to subscribe to datasets.
Sinosplice is a blog focused on learning Mandarin Chinese, maintained by John Pasden. It offers free resources including a beginner's guide to Chinese pronunciation, a guide to the five stages of learning Chinese, material on learning tones, tone pair drills and Chinese grammar hurdles, alongside articles about life in China.
Sirah is a platform for reading source-attributed hadith texts from established collections, with Arabic text, translations and source grading. It also offers study guides connecting Quran references and narrations, plus an AI assistant that provides source-linked answers. Readers are advised to check quotations and references against the cited sources.
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.
Sirius ($SIRS) is a liquidity pair-based token on Tezos that lets holders participate in Liquidity Baking, a decentralized liquidity pool between tez and tzBTC incentivized at the protocol level. Purchasing Sirius is presented as a simpler way to earn liquidity baking rewards, which are paid in tez. The source notes a risk of impermanent loss from the tzBTC/tez pair.
Sisif renders short AI videos from text prompts. It charges $1 per 5-second clip with no subscription, and the site says credits never expire. Clips carry no watermark, and the service offers portrait video plus a REST API with pay-per-call support for agents.
A personal repository for serving web content and APIs for larger projects and games, also used as a download CDN for large files. It hosts online games including Eaglercraft, Eaglercraft Beta, and Five Nights At Winston's, plus tools such as an Eaglercraft 1.5.2 Crash Viewer and a CSS Sprite Sheet Generator.
SITE123 is a free website builder that requires no design or coding skills. It provides a website editor, responsive design, free hosting, SEO tools, online store and blog features. A free plan includes 250 MB storage and bandwidth on a subdomain, while premium plans add a free domain for one year and domain connection. Support is available 24/7 by live chat.
SiteAnalyzer is a website crawler for technical audits and SEO optimization. It scans site pages and checks more than 60 parameters, including broken links, duplicate pages, meta tags and server response codes. It offers integrations with Google Search Console, Yandex Webmaster and Yandex Metrica, internal PageRank calculation, site structure visualization and sitemap generation. A free version and a Pro plan are available.
SiteGPT is a platform that builds custom AI customer support chatbots trained on a website's content. The chatbots answer visitor questions, support over 95 languages, and can be used for lead generation. The service integrates with various tools and provides features such as a knowledge base, multichannel support, and an onboarding process.
SitePoint provides educational videos, lessons, tutorials, or self-learning resources.
SITES Data Portal is a data portal for the SITES research infrastructure, which operates a network of Swedish research stations and runs thematic research programs. The portal hosts datasets related to aquatic, terrestrial, atmospheric and biological research themes, provides information on data licensing, usage acknowledgement, and data management planning, and offers access to related research resources, publications and outreach materials.
Sit In Shade is a travel tool for finding the seat that stays in the shade during a journey. It provides real-time sun exposure data and route visualization. Users enter a date, time estimate, duration and timezone.
A soundtrack archive site covering video game and animation music. It lists recent releases and a last-added section, along with links to more game and animation releases and a random pull highlight. A Discord server is referenced for updates on broken MEGA links.
SiYuan is an open-source, local-first, privacy-first note-taking app. It offers Markdown, block references, bidirectional links, databases, and multi-device sync for personal knowledge management. Content is organized at the block level, with built-in block-level and span-level elements, and blocks support zoom-in focus with breadcrumb navigation. A free tier includes local storage; PRO features require a one-time purchase and third-party sync services.
SKiDL is a Python module for describing the interconnections of electronic circuits and components. The resulting Python program performs electrical rules checking and outputs a netlist used as input to a PCB layout tool.
