Leanote (formerly Leamonax) is a third party Android client for Leanote, an open source alternative to Evernote which you can also find at Github.

Leanote supports Richtext, Markdown, search, sync and more.

AntiFeatures: uses Bugly for crash reports.

Note: the app's repo seems to be no longer maintained (no activity since 4/2019), so there will be no more updates.
Anti-Features:
NonFreeComp (the application includes non-free components):
⇒ App includes Bugly Android SDK (crash reporting)
Trac