Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.