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 [uNote](https://gitlab.com/Varlorg/uNote) | OI Notepad | Smallest (71KB) open source notepad app that I could find.
 [KeePass DX](https://www.keepassdx.com/) | [KeePassDroid](http://www.keepassdroid.com/) | Utilise Material theme so it looks more modern and feels lighter.
 [Lithium](https://play.google.com/store/apps/details?id=com.faultexception.reader&hl=en) | FBReader | Free but proprietary EPUB reader. The best feature is read by scrolling; each chapter is displayed as a long text and you scroll down as you read. I find this feature faster than flip-by-swipe and without the accidental touch issue of flip-by-tap.
+[Pdf Viewer Plus](https://github.com/JavaCafe01/PdfViewer) | Google PDF Viewer | For a simple pdf viewer, I liked Google PDF Viewer due to its minimal size ([5MB](https://www.apkmirror.com/apk/google-inc/google-pdf-viewer/google-pdf-viewer-2-7-332-10-release/google-pdf-viewer-2-7-332-10-40-android-apk-download/)). An open-source alternative is Pdf Viewer Plus. It uses vertical scrolling just like the Google's (and most desktop PDF viewers) and offers themes (for dark theme users). If you prefer/don't mind horizontal scrolling, another alternative is [MuPDF viewer](https://f-droid.org/en/packages/com.artifex.mupdf.viewer.app/) which has smaller APK and supports more formats (i.e. XPS, OpenXPS, CBZ, EPUB, and FictionBook 2).
 [Unit Converter Ultimate](https://github.com/physphil/UnitConverterUltimate) |  | The only unit converter app that you would ever need. Supports every practically possible units including currency.
 [andOTP](https://github.com/andOTP/andOTP) | Google Authenticator | Open source and dark theme.
 [Loyalty Card Keychain](https://f-droid.org/packages/protect.card_locker/) | Google Pay | Simply to store loyalty cards with barcode.