Deduplicating archiver with compression and authenticated encryption.
BorgBackup (short: Borg) is a deduplicating backup program. Optionally, it supports compression and authenticated encryption.
The main goal of Borg is to provide an efficient and secure way to back up data. The data deduplication technique used makes Borg suitable for daily backups since only changes are stored. The authenticated encryption technique makes it suitable for backups to targets not fully trusted.

Kiwix lets you access free knowledge – even offline
Internet. Offline.
Store any website on your mobile phone or computer, easily.
Wherever you go, you can browse Wikipedia, read books from the Gutenberg Library, or watch TED talks and much more – even if you don’t have an Internet connection.
Kiwix @ GitHub

VroumVroumBlog is an automatic blog software tool used to replicate content from a blog or any site with a RSS or Atom feed. This is a tool used to fight censorship and help blogs to stay online through dozens of mirrors even if they are forced offline (also known as the Streisand effect).

PeaZip is an Open Source file and archive manager: flexible, portable, secure, and free as in freedom. Extract, create and convert multiple archives at once, create self-extracting archives, split/join, strong encryption, secure deletion, advanced search and compare features...