Inc is described as 'is your team's workspace for sharing and organizing knowledge' and is a Note-taking Tool in the Office & Productivity category. There are more than 25 alternatives to Inc for a variety of platforms, including Windows, Android, Online / Web-based, iPhone and Mac. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or CherryTree. Other great apps like Inc are Cryptee (Freemium, Open Source), Notezilla (Paid), Notejoy (Freemium) and Inkdrop (Paid).
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, can be copied, tagged and modified either from the applications directly or from your own text editor.
Notezilla is the leading sticky notes app for Windows, Android, iPhone/iPad and the web. Set reminders to sticky notes, Pin sticky notes, attach them to websites, docs & folders, sync between PCs and other devices, organize using folders and tags.
NixNote, formerly Nevernote, is an open source client for Evernote . It is written in Java so it will also run on Windows & OS-X, but the primary focus has been to try and get a usable environment for Linux.