Backup SMS by Piandro - Backup SMS is an app by Piandro that allows you to choose the desired conversation or text message to add it to the backup list to save it for later use.
Documize - Enterprise-grade wiki and knowledge management platform
Contacts Backup and Restore Contact - Contacts Backup and Restore Contact app enable users to get back all their lost and deleted phone numbers by restoring the available backup file with a single tap.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.