Almanac is described as 'knowledge base that combines wisdom from tech leaders with your team's own practices' and is an app in the office & productivity category. There are more than 100 alternatives to Almanac for a variety of platforms, including Online / Web-based, Windows, Android, iPhone and Mac. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Microsoft OneNote or Trello. Other great apps like Almanac are Notion, Evernote, Simplenote and Google Docs.
Instiki is a basic Wiki clone so pretty and easy to set up, you’ll wonder if it’s really a Wiki. Runs on Rails and focuses on portability and stability, Supports file uploads, LaTeX export, RSS feeds, S5 slideshows, multiple users and password protection.
Quiver is a notebook built for programmers. It lets you easily mix text, code and Markdown within one note, edit code with an awesome code editor, live preview Markdown and LaTeX cells, and find any note instantly via the full-text search.