Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.

Clariti.app - Clariti is a team communication app that uses Artificial Intelligence to combine emails, chats, documents, calendar events and feeds on the same topic, in rich context-based Conversations to ensure your communication stays focused & organized.

Anchor CMS - Free and lightweight blogging system

CiraSync - CiraSync is a program that syncs and shares office 365 GAL contacts and calendars to smartphones.

Textpattern - Textpattern is an elegant content management system that is free, open source software.

Attio - Attio is a radically new type of CRM that is real-time, entirely customizable and intuitively collaborative. Using Attio, your team can create, build and deploy your CRM exactly as you want it.