deplate is a tool for converting wiki-like markup to latex, docbook, html, or "html-slides". It supports embedded LaTeX code, footnotes, citations, biblographies, automatic generation of an index etc.
Relaxed is an HTML validation app. as well as a XHTML 1.0 / HTML 4.01 and WCAG 1.0 schema definition written in Relax NG with embedded Schematron. Those expressive languages allow automated validation of many additional restrictions inexpressible by DTD.
Lightweight XML based transformation tool written in C that builds upon expat, tidylib and XSLT to tranform authored web content (incl. Word processor generated HTML) into styled web content suitable for publication.
XWeb is a commandline program that can be used to create HTML websites from XML and XHTML data. The basic processing part is done by an XSLT processor, XWeb itself handles the navigation information and adds some rendered images for buttons and banners.
Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.