Top 20 NuGet android-library Packages

Android's seekbar that contains 2 cursor (left and right). Multiple touch supported.
A custom SeekBar on Android, which can be changed the size, color, thumb drawable, tick drawable, tick text and indicator, also, will show an indicator view with progress above SeekBar when seeking.
Xamarin.Android library to show reacting badges like Facebook.
An Android library to build flying animated toast message.
Lollipop ViewAnimationUtils.CreateCircularReveal for everyone 4.0+
Convert your TextView in ExpandableTextView with added options ReadMore/ReadLess.
Fixed viewport image cropping library for Android with built-in support for Picasso, Glide or Universal Image Loader.
BadgeView for Xamarin.Android
TheFinestArtist's Annotations
Round Corner RelativeLayout for Xamarin.Android
Apache Commons Net library implements the client side of many basic Internet protocols such as FTP/FTPS, FTP over HTTP (experimental), NNTP, SMTP(S), POP3(S), IMAP(S), Telnet, TFTP, Finger, Whois, rexec/rcmd/rlogin, Time (rdate) and Daytime, Echo, Discard and NTP/SNTP
The Apache Commons CLI library provides an API for parsing command line options passed to programs. It's also able to print help messages detailing the options available for a command line tool.
Write your app using System.Net.Http, but drop this library in and it will go drastically faster. This is for Xamarin.Android only.
jsoup is a Java library for working with real-world HTML. It provides a very convenient API for extracting and manipulating data, using the best of DOM, CSS, and jquery-like methods.
Xamarin.Android Binding for Kotlin Common Standard Library (org.jetbrains.kotlin:kotlin-stdlib-common). Note: This is an "EmbeddedReferenceJar". It will not generate any Android Callable Wrappers (ACW) and C# API.
Lightweight Image Cropper for Android which also supports no-crop feature
Simple wrapper library for Android ImageView. If you need an always square or rectangular Imageview, SquareImageView is for you.
LocationProvider is a tiny library that abstracts away a lot of the pain of getting a users location from the phone (without having to call location APIs), provides a fully configurable standard Builder pattern and a set of callbacks.
Xamarin.Android Binding for Qstumn's https://github.com/qstumn/RadarChart