Test and validate your robots.txt with this testing tool. Check if a URL is blocked, which statement is blocking it and for which user agent. You can also check if the resources for the page (CSS, JavaScript, images) are disallowed.

Infinite Mac is a collection of classic Macintosh and NeXT system releases and software, all easily accessible from the comfort of a (modern) web browser.

Pick any version of System Software/Mac OS or NeXTStep/OPENSTEP from the 1980s or 1990s and run it (and major software of that era) within a virtual machine. You can also run a custom version with your choice of machine and virtual disks. Files can be imported and exported using drag and drop, and System 7 and onward have more advanced integrations as well – refer to the welcome screen in each machine for more details.

With this demo, you can supply an Input string and see the combinations that are confusable with it, using data collected by the Unicode consortium. You can also try different restrictions, using characters valid in different approaches to international domain names.

Jamulus is software for playing music, rehearsing, or just jamming with anyone online with low latency. You can use your Windows, macOS or Linux machine to connect to Jamulus servers worldwide. Jamulus is free and you can just use your normal broadband connection. Simply connect to a public server or host your own private one. Jamulus has been in development since 2006 and is designed for high quality, low-latency sound, making it easy to play together remotely and in time.

TinyLetter is a personal newsletter service brought to you by the people behind Mailchimp. People use it to send updates, digests, and dispatches to their fans and friends.

Though they're built on the same infrastructure, TinyLetter is for people who don't need all the business features that come along with Mailchimp. Simplicity is at the heart of everything we do at TinyLetter.

TinyLetter is a completely free service.

Japan’s National Theatre has risen to the occasion after the cancellation of Yoshitsune Senbon Zakura (Yoshitsune and the Thousand Cherry Trees), which was originally scheduled to open for audiences in Tokyo on March 3 of this year. Instead, the performance, sans audience, will be posted to the theatre’s online YouTube channel. In fact, the play, split into three videos, is available for viewing right now, and will be free to watch to your heart’s content until April 30, 3:00 p.m. JST.

Japanese language exercises aimed at school children but also great for non-native learners like me. For me it didn't work in Firefox, which is my preferred browser, but this could possibly be because of my paranoid privacy-enhancing browser extensions.

From author's notes:

Let’s get this straight: The effort to host Google web fonts on your own server is immense! First of all you need to download all .eot, .woff, .woff2, .ttf and .svg files, then copy them onto your server and finally paste a CSS snippet.

Sounds easy? Well it could be, if Google would actually provide any direct links to download these files and a customized CSS for self-hosting them. To fix this problem without using font generation services like Font Squirrel, I decided to publish a little service called google-webfonts-helper.

This site is the home- and demopage of the SAE, an Amiga emulator in pure HTML5 and JavaScript.

It is heavily based on WinUAE and does use the AROS Kickstart replacement.

Satori Reader provides carefully curated, level-appropriate content with which to practice and grow. With thoughtfully annotated articles spanning a variety of interesting subject matter and a unique system that presents content in a manner appropriate to your knowledge, it bridges the gap between the controlled, textbook Japanese that most students start with and the wide-open world of real-life, native communication.