Web/JavaScript/TypeScript

• vcard4-ts — vCard version 4 parsing, TypeScript-style (2021–): A new, developer-friendly, and type-safe approach at vCard parsing.

Timestamping with PGP and git

• zeitgitterd—Zeitgitter server (2019–): The distributed git– and OpenPGP-based timestamping service
• git timestamp—Zeitgitter client (2019–): Timestamp to a git repository; verifiable with the native git tools
• autoblockchainify—Automatic Zeitgitter client (2020–): Automatically turn a directory into a timestamped blockchain
• PGP Digital Timestamper Timestamped Archive (2019–): Cross-timestamping and archiving the PGP Digital Timestamper (running since 1995!)

DNS (and git)

• dnstemple—DNS TEMPLating Engine (2020–): Simplify, modularize and automate managing your DNS zone files
• drag—A lightweight webhook listener/process manager for Docker (2020–): Just prepend drag to your docker command line and your image reacts to webhook requests.

Backup

• fake-super—Recover a rsync --fake-super backup without copying (2020–)

Software Security

• TLS Interposer: Upgrade OpenSSL security for legacy applications (2013–2015): How to enforce (security) parameters using LD_PRELOAD. Retired, as this is now no longer necessary.

Online Tool (not yet Open Source)

• SOGo autoconfigurator for iOS and OSX (2013–2014): Retired, please let me know if there is (again) demand for this.