A danbooru-style image board, designed to be easier to install, run, and extend.
Requires a standard LAMP stack as provided by any normal web host. It can also use PostgreSQL as a database, which is recommended for high-load sites.
This is probably my most popular project, with a team of 10 coders, hundreds of installations, and thousands of users online at once.
Laverna is a JavaScript note taking application with Markdown editor and encryption support. Consider it like open source alternative to Evernote. https://laverna.cc/index.html
To install an SSL certificate on your virtual private server, the first step is to generate a key for the Certificate Signing Request (CSR). If the certificate will be used by service daemons, such as Apache, Postfix, Dovecot, etc, a key without a passphrase is often appropriate.
Siema is a lightweight (only 1kb gzipped) carousel plugin with no dependencies and no styling. As Brad Frost once said "do that shit yourself". It is 100% open source and available on Github. It is free to use on personal and commercial projects. Use it with your favourite module bundler or by manually injecting the script into your project.
Cross-site scripting (XSS) attacks, for example, bypass the same origin policy by tricking a site into delivering malicious code along with the intended content. This is a huge problem, as browsers trust all of the code that shows up on a page as being legitimately part of that page’s security origin.
HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (better known as XSS) with a thoroughly audited, secure yet permissive whitelist, it will also make sure your documents are standards compliant, something only achievable with a comprehensive knowledge of W3C's specifications.