codeocean.com
Searchable repository for finding atmospheric, oceanography and climate datasets and datasets.
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imagecolorpicker.com
A browser-based tool for picking colors from an uploaded image, clipboard paste or URL, returning HEX, RGB and HSL codes. Every color tool is free forever, and a Supporter option removes ads. Processing happens in the browser and no data is sent.
comfy.guide
Comfy.Guide is a collection of computer guides. Its server software section covers self-hosting services such as email, DNS, IRC, Matrix, XMPP and PeerTube. Its client software section covers desktop tasks, including disk encryption, GnuPG, the KISS Linux distribution and using NVIDIA on Linux.
connectbot.org
ConnectBot is an open-source SSH and Mosh client for Android. It gives access to remote terminals, lets users keep several sessions open and switch between servers, and supports secure SSH tunnels via port forwarding. Sign-in uses a password or SSH key. Mosh helps terminals recover from interruptions but requires compatible server software.
addons.mozilla.org
ContextSearch web-ext is a Firefox browser extension compatible with Firefox 57 and later. It lets users select text to search using the context menu or a tiled popup with any installed search engine. Users can add new search engines via right-click, edit favicons and query strings, and the extension supports both POST and GET requests, with a simple, highly configurable user interface.
codeberg.org
Conversations is an open source XMPP/Jabber client for Android. It offers end-to-end encryption with OMEMO or OpenPGP, file and image sharing, encrypted audio and video calls, private group chats and public conferences, multiple accounts and location sharing, with a Material Design 3 interface. Some features require server support.
convert2video.com
Online converter for turning media files into video formats and web-ready clips.
convertcsv.com
ConvertCSV.com is a collection of online tools for converting CSV and Excel data to and from formats such as JSON, XML, SQL, YAML, KML, GeoJSON, HTML, Markdown and PDF. It also provides a CSV viewer and editor, a CSV validator, SQL querying and data extraction tools. The tools run on the client side, so data never leaves the computer.
orteil.dashnet.org
Browser-based game in which clicking produces cookies, with save import and export options. The page displays a changelog documenting fixes and features such as cookies per second and reworked grandmas.
cookie-editor.com
Cookie-Editor is an open-source browser extension for creating, editing and deleting cookies for the current tab. It lists cookies on the current page, allows creating, editing and deleting cookies, and can import cookies or export them to the clipboard. It is available for Chrome, Firefox, Safari, Edge and Opera.
coolfont.org
An online font generator that offers free fancy fonts for input text. Users can click a desired font and paste the result elsewhere. The site lists many font styles, including bold, italic, monospace, bubble, fraktur, small caps, upside down and strikethrough.
marine.copernicus.eu
The Copernicus Marine Environment Monitoring Service provides free and open marine data and services. It offers an ocean data catalogue for downloading or visualising hindcasts, nowcasts and forecasts, along with the Ocean State Report, Ocean Climate Trends indicators, and three ocean visualisation tools for different user levels.
addons.mozilla.org
Copy Selected Links is a browser extension developed by Marnes. It enables users to right-click selected text containing links to copy the URLs of all included links, copy their associated text, or open the links in new tabs. The extension is available for Firefox and Chrome, with its source code hosted on GitLab. Updated versions of related tools from the developer are available on their Greasyfork account.
copychar.cc
CopyChar is a basic application for finding and copying special characters to the clipboard. A character is copied by clicking or tapping it. The listed characters include arrows, punctuation marks, symbols, emoji and keyboard symbols.
ocr.space
Copyfish is an open-source OCR software and text extractor that copies, pastes and translates text from images, videos or PDFs. It runs in Chrome, Edge and Firefox and works on Windows, Mac and Linux. A desktop capture feature requires the XModule2 helper app.
cugir.library.cornell.edu
CUGIR is a repository offering datasets and scanned maps. Datasets can be browsed by theme or found by zooming a map to an area and clicking a search button. Themes include boundaries, geology, agriculture, land cover, transportation, climate and elevation. The scanned maps section provides access to all map holdings.
cdaac-www.cosmic.ucar.edu
Research data portal for exploring atmospheric, oceanography and climate records, including datasets.
somacon.com
Count Duplicates is a free online JavaScript tool that aggregates pasted lines and shows the count of occurrences of each value. Results include unique values, occurrence counts, the total number of lines and the number of unique values. Output can be copied in TAB or CSV format for spreadsheets. Data is processed client-side in the browser and is not sent or stored elsewhere.
coy.im
CoyIM is a standalone chat client for XMPP that runs on Windows, Linux and macOS with no settings, plugins or configuration required. It has built-in support for Tor, OTR and TLS. The project states it has not yet been audited and advises against sensitive use.
cpre.org.uk
An online map of England's light pollution and dark skies. Users can search by postcode, district or National Character Area, tick boundaries in the legend to display them, and click the map for detailed information about an area. The map uses OpenStreetMap and World Imagery data and was developed by LUC.
crackmy.app
CrackMy.App is a community site for sharing crackmes and solving reverse engineering challenges. Users can upload crackmes, solve challenges from other users, earn points and climb a leaderboard, with sections for latest and popular crackmes and recent solutions.
cre8tiveai.com
Cre8tiveAI is an AI-based software-as-a-service tool for photo, illustration and video editing that completes tasks in under 10 seconds. Its features include automatic painting, image and video resolution upscaling, clipping, layering, and color correction. Specific offered tools are Photo Refiner, which upscales images and illustrations by up to 16 times; Face Refiner, which improves face and overall image quality by removing blur and noise; SAI, which generates original character face illustrations; Portrait Drawer, which creates 8 types of portraits from identified faces in photos; and Moving Photo Maker, which converts photos to 3D and then to video.
creativity103.com
An image resource providing free abstract backgrounds, textures and design elements that can be cut and pasted into designs or used for inspiration. The site states it contains more than 2500 files, about 6GB of abstract digital photos, backgrounds and basic video clips, available under a Creative Commons Attribution 3.0 License with credit to the site and contributor required.
crop-video.com
A free browser-based tool for cropping video files, using HTML5 and JavaScript so files are processed locally without upload. Users set the cropping area with the mouse or by entering values and can set start and end times. Output format can be configured, and supported formats include MP4, WEBM, MOV, FLV, MKV and AVI.