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Sega Play is a website for playing classic SEGA games online for free in a browser, without ads or downloads. It lists 100 games, including Sonic the Hedgehog, Streets of Rage and Tiny Toon Adventures, and offers save progress.
Segoideas is a non-English web resource for regional media, books, tools, communities, or learning.
SeiresHD is a non-English web resource for regional media, books, tools, communities, or learning.
Sejda is an online PDF service offering an editor and over 30 PDF tools, including merging, splitting, compressing, cropping, filling and signing, and converting PDFs to images or Word. It works online or offline, in the cloud or as a desktop application, with no installation required. Developer documentation covers an HTML to PDF API and 'Save as PDF' links for websites.
Userscript for Select All Checkboxes, adding browser customization or automation to supported websites.
Selezen is a non-English web resource for regional media, books, tools, communities, or learning.
SelfControl is a free, open-source macOS application that blocks access to distracting websites, mail servers, or other internet destinations for a pre-set period. Until the timer expires, blocked sites remain inaccessible even after restarting the computer or deleting the application.
selfh.st is a storage, design, or frontend resource for mockups, assets, UI tools, or web search.
selfoss is an open-source, web-based RSS reader and multi-source mashup aggregator that collects posts, tweets and feeds into a single place. It is a lightweight PHP application supporting MySQL, PostgreSQL and SQLite databases, with an adaptive mobile layout, OPML import and a plug-in system. Configuration uses a config.ini file or environment variables.
Semantic Art Search is a search instance or metasearch resource for private web discovery.
SemanticDiff for GitHub is a web tool that lets users review GitHub commits and pull requests using a language aware diff. Users log in via GitHub. The site links example pull requests from axios, DevToys and Apache Drill.
Semrush's Keyword Magic Tool helps research keywords, search demand, related terms, and content opportunities for SEO.
Desktop oriented webapp for Mastodon and Pleroma, focused on multi-accounts usages.
senmanga is a non-English web resource for regional media, books, tools, communities, or learning.
Screenshot is a screenshot or image reference showing changes, evidence, examples, or notes.
Sentinel is a studio that builds privacy-first apps for iOS, macOS, Android and the web. Its listed apps include Authenticator for two-factor authentication, Squidly for merging wallet and exchange balances, Crypto Warden for storing crypto seed phrases in iCloud Keychain, Turbo Jobs for CV tailoring and a Quotes App.
Sentora helps with crypto security, portfolio tracking, auditing, risk monitoring, or asset protection.
SEO Chat Tools is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
SEO Gets is a Google Search Console and GA4 analytics tool for SEO professionals. It offers a master dashboard consolidating search console websites, content groups, striking distance, cannibalization and content decay analysis, index reporting and monitoring, and an MCP server for plugging SEO data into AI assistants. Magic share links share dashboards without requiring account creation.
SEO Minion tracks rankings, SERP visibility, and keyword performance across search results.
SEO PowerSuite helps analyze backlinks, find link opportunities, and support SEO outreach workflows.
SEO Review Tools helps plan, write, optimize, or analyze content for SEO and search visibility.
SEO Search Simulator tracks rankings, SERP visibility, and keyword performance across search results.