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jfxr is a browser-based tool by @frozenfractal for creating sound effects, with controls for amplitude, pitch, tone, filters and output. The page notes that exporting WAV files is broken on Safari, and saving opens a new tab that can still be saved manually.
Jigsaw Code is a code project with source, releases, documentation, or setup notes.
Genamics JournalSeek is a categorized database of scholarly journal information. It records journal descriptions, abbreviations, homepage links, subject categories and ISSNs, and the site states the database contains 39226 titles. Searching this information helps identify journals to publish in. The site notes that JournalSeek does not contain articles or abstracts.
JScreenFix is a browser-based tool for repairing stuck pixels on LCD and OLED displays. It runs a high-frequency pixel exercise pattern in the browser, and users drag a fixer square over the affected pixel and leave it running for at least 10 minutes. The site notes that dead pixels are usually hardware failures less likely to be revived by software.
jsdfe is a JavaScript deobfuscator built on nodejs and babel. Its purpose is to make obfuscated scripts easier to read and help users understand their roughly behavior. It is not intended to reproduce the original code or output executable code. The developer created it for personal use and notes that it often terminates with an uncaught error, may go into an infinite loop, and runs target code in a VM without considering security.
JuMLi provides automated feedback on RimWorld modlists. Users export their modlist from RimSort to the clipboard, paste it into a text field, and submit it; the site then presents notes on the list. The page advises using RimSort rather than in-game sorting or RimPy.
Julia Evans writes a personal blog about computer tools and programming topics, with posts organized by category. The site notes that a weekly digest of posts is available by subscription, and mentions that she publishes computer zines at Wizard Zines.
JummBox is an online tool for sketching and sharing instrumental music. Notes are placed into patterns, and several rows of patterns can play simultaneously, with the bottom row intended for drums. Features include keyboard shortcuts, pitch bending, volume adjustment, selections and copy/paste of patterns.
JustNotepad.com is a free online notepad for creating plain-text notes in a web browser without sign-up. It provides autosave, a multi-page notepad and character and word counters, storing drafts in the browser on the user's device. It has no text formatting and is not a replacement for paper notepads or a backup service.
Kakuro Puzzle is a free online number crossword game offering daily, regular and unlimited puzzles. Players fill white cells with digits 1 through 9 so each across and down run matches its clue sum, without repeated digits in a run. The site includes rules and strategy guidance and a number pad with notes and a Check option.
Self-hosted app for saving bookmarks, notes, and web resources in a personal knowledge library.
Kasu is a technology platform that gives lenders access to private credit markets. Lenders fund specialist lending companies that make short-term loans to creditworthy businesses, earning interest capitalised weekly. The site describes lending strategies across taxation funding, professional fee funding and payment finance, with rates stated as ranges, and notes that capital is at risk.
KeePassXC is a cross-platform, open-source password manager that stores usernames, passwords, URLs, attachments and notes in an offline encrypted file. It runs on Windows, macOS and Linux and is licensed under GPLv3.
An article comparing the roles of data scientist and data engineer. It states that the positions are sometimes confused for each other and are often treated as the same, though the two roles work together. It notes that companies can encounter problems with team efficiency and system performance when the roles are conflated, and that the average company needs far more data engineers.
Key Test is an online tool for checking keyboard button functionality directly in a web browser. Users can test individual keys by pressing them, with specific guidance for testing Fn keys in combination with other common inputs. The service notes that all testing is performed at the user's own risk, and recommends contacting a service center if users are uncertain whether a key issue is hardware or software related.
Keygen Music is an online tracker music player charged with music from keygens. It streams chiptune tracks directly in the browser and states 4,350 tracks, 6 days 12 hours of non-stop music. The site supports .mod, .xm, .s3m and .it formats and notes no keygens are hosted, only the music.
Knowt is an AI-powered study and education tool for students and teachers. It offers features including AI lecture notetaking, unlimited free flashcard creation and study modes, PDF and video summarization, standardized test preparation, and tools to convert user notes to active recall study materials. Bulk paid licensing options are available for schools and districts.
The Korea Sequence Read Archive (KRA) is a publicly available repository of high throughput sequencing data. It stores qualified raw sequencing data and alignment information and facilitates reproducibility through a cloud-based data analysis service. The site states it is in English only, and news notes restrictions on duplicate data submissions and data brokering to the DDBJ Sequence Read Archive.
A weekly news and interview podcast covering the Kubernetes community, including release discussions, projects, and AI policy topics. Episodes feature guests from the Kubernetes ecosystem and are hosted as numbered installments with accompanying show notes.
Kwame Nkrumah University of Science and Technology is a university in Kumasi, Ghana. Its website announces the postponement of reopening for the 2026/2027 academic year due to an ongoing GAUA strike, with a revised date to be announced. It also reports the investiture of Prof. Christian Agyare as the 13th Vice-Chancellor and notes that application e-vouchers for Postgraduate/Top-Up programmes for 2026/2027 are on sale.
Last Epoch Tools is a collection of tools for the action RPG Last Epoch. The site provides a build planner, builds, loot filters, a checklist, ladders and character profiles, along with item, skill and dungeon resources. It notes that not all build planner calculations are updated yet.
Learn C is a free interactive tutorial site for learning the C programming language, intended for both experienced programmers and beginners. It presents chapters from Hello, World! through pointers, structures, recursion and linked lists, and requires no download. The site notes it is still under construction.
Learn Sanskrit Online describes itself as a simple and complete guide to Sanskrit, with tools and resources for all levels. It includes a beginner's guide and notes on Ambuda, traditional Sanskrit texts with word-for-word analysis and an integrated dictionary, and a grammar series on the Aṣṭādhyāyī. Sanscript converts Sanskrit text between scripts.
Letterfork is an AI tool that turns one Substack, Beehiiv or Ghost newsletter issue into posts for LinkedIn, X, Bluesky, Substack Notes, Threads, Instagram and Reddit in the writer's own voice. Users train a voice profile from past newsletters, then paste an issue to generate platform-native drafts.
