Resend is an email platform for developers. It provides an interface for sending transactional and marketing emails, with SDKs for programming languages. Features include modular webhooks for delivery, open, bounce and click notifications, a test mode, contact management, broadcast analytics, and email development using React.
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The Rolling Deck to Repository (R2R) program provides fleet-wide management of underway data from oceanographic research vessels. It catalogs and submits underway environmental sensor data from research expeditions to long-term public archives, including the NOAA National Centers for Environmental Information. Vessel operators submit cruise data directly. R2R supplies documentation, standard products and tools for documenting shipboard data acquisition, plus post-cruise quality assessment and near-real-time meteorological data assessment.
Rsync is a GitHub repository or organization with source code, releases, documentation, or project resources.
Security Onion Solutions, LLC is the creator and maintainer of Security Onion, a free and open platform for threat hunting, network security monitoring and log management. It bundles free and open tools including Suricata, Zeek and the Elastic Stack, and the company sells products and services that fund development.
Sefirah is a GitHub repository or organization with source code, releases, documentation, or project resources.
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.
Sendme is a GitHub repository or organization with source code, releases, documentation, or project resources.
ShredOS is a GitHub repository or organization with source code, releases, documentation, or project resources.
Shutter Encoder is a GitHub repository or organization with source code, releases, documentation, or project resources.
Signaturepdf is a GitHub repository or organization with source code, releases, documentation, or project resources.
sist2 is a GitHub repository or organization with source code, releases, documentation, or project resources.
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.
SlidesAI is a web-based tool that turns text, notes, documents, PDFs and prompts into presentations. It works within Google Slides, PowerPoint, ChatGPT and a browser-based web app. The Basic plan costs $0/month and includes 12 presentations per year. The Pro plan costs $10.00/month billed at $120/year and adds document upload.
Automated concentrated liquidity management protocol on Base and Arbitrum, supporting Uniswap V3, Aerodrome, PancakeSwap, SushiSwap V3 and Camelot V3. Users deposit Bitcoin, ETH or stablecoins, and the protocol repositions out-of-range positions without swaps by creating single-sided positions at the price boundary. It offers strategy presets and automatic compounding. Documentation lists risks and disclaimers.
Stirling is a free, private, open-source PDF editor that can be deployed on user-managed infrastructure. It provides a PDF reader, a PDF editor with over 60 tools, and a PDF processor for batch handling of large volumes of documents. The tool is designed to keep user files on their own systems, with publicly available source code for audit.
storage.to is a file-sharing service for sending large files and getting a download link. Its documentation lists web, desktop app, CLI, ShareX and REST API upload methods. Limits vary by account: no-account uploads are capped at 25 GB per file and 50 files per 24 hours in the API, CLI and apps, with files expiring after 3 days by default.
SuperCompression is a website that provides programs, tools, and information related to maximum file compression. It offers utilities such as Ultra7z Archive Optimizer, Ultra FreeArc Optimizer, Ultra RAR Optimizer, UPX Optimizer, and converters for images to JPEG XL and video to AV1/H265/H264 formats, alongside related documentation and posts.
Superlist is a task management and to-do list app for tasks, notes, and projects. It offers AI that turns voice recordings into action items and summarizes meeting notes. It supports tasks, subtasks, lists, and sharing, and runs on Mac, Web, iOS, and Android. It is free to start.
Surge is a GitHub repository or organization with source code, releases, documentation, or project resources.
Syncthing is a continuous file synchronization program that synchronizes files between two or more computers in real time. Communication is secured using TLS with perfect forward secrecy, and each device is identified by a cryptographic certificate. The protocol is documented and the source code is available on GitHub. It runs on macOS, Windows, Linux, FreeBSD, Solaris, OpenBSD and other systems, and is configured through a browser interface.
Tahoe Lafs is a GitHub repository or organization with source code, releases, documentation, or project resources.
Termscp is a GitHub repository or organization with source code, releases, documentation, or project resources.
Tideflow is an offline desktop application that converts Markdown into PDF documents using Typst. It provides a split editor and PDF preview with real-time two-way scroll sync, twelve themes, LaTeX math rendering via MiTeX, automatic table of contents, and bibliography and citation support. It does not aim to replace advanced publishing systems.
tl;drLegal is a reference site that summarizes and explains software licenses in plain English. It offers a library of popular licenses summarized at-a-glance, marked as verified content. The site is brought to you by FOSSA, described as an open source management platform.