Awesome Loading Indicators 
Awesome list about loading indicators in different languages and formats.
Contents
C/C++
- indicators - Activity Indicators for Modern C++.
C#
- RadialProgressBar - Customizable radial progress bar shader for Unity3D. Allows you to set arc range, minimum and maximum colors, textures, radius, and a few more things. Create HP Bars, Speedometers, rank progress, etc!
CSS
- CSS loader - Simple loaders for your web applications using only one div and pure CSS.
- CSSPIN - CSS Spinners and Loaders - Modular, Customizable and Single HTML Element Code for Pure CSS Loader and Spinner.
- css-spinner - Collection of 12 small, elegant pure css spinners for your website's loading animation.
- Loaders.css - Delightful, performance-focused pure css loading animations.
- PACE - Automatically add a progress bar to your site.
- Single Element CSS Spinners - A collection of loading spinners animated with CSS.
- SpinKit - Simple loading spinners animated with CSS.
- SpinThatShit - A set of SCSS mixins for single element loaders and spinners.
- text-spinners - Pure text, CSS only, font independent, inline loading indicators.
Dart
- flutter_easyrefresh - A flutter widget that provides pull-down refresh and pull-up load.
- Flutter Spinkit - A collection of loading indicators animated with flutter.
Go
- Multi Progress Bar - Multi progress bar for Go cli applications.
- progressbar - A really basic thread-safe progress bar for Golang applications.
- Terminal progress bar for Go - Console progress bar for Golang.
- uiprogress - A go library to render progress bars in terminal applications.
Java
- Android NumberProgressBar - A beautiful, slim Android ProgressBar.
- android-shapeLoadingView - 高仿新版58 加载动画.
- Android-SpinKit - Android loading animations.
- Animated Circle Loading View - An animated circle loading view.
- CircleProgressBar - A circular android ProgressBar library which extends View, and the usage same as ProgressBar, It has solid,line and solid_line three styles. Besides, progress value can be freely customized.
- Download Progress Bar - DownloadProgressBar is an android library that delivers awesome custom progress bar. You can manipulate it's state in every way.
- GoogleProgressBar - Android library to display progress like google does in some of his services.
- LoadingDrawable - Some beautiful android loading drawable, can be combined with any view as the LoadingView or the ProgressBar.
- LoadingView - A simple loadingview for android with animation.
- MaterialProgressBar - Material Design ProgressBar with consistent appearance.
- MetaballLoading - A 2d metaball loading.
- mkloader - Beautiful and smooth custom loading views.
- Road Runner - Road Runner is a library for android which allow you to make your own loading animation using a SVG image.
- RoundCornerProgressBar - Round Corner Progress Bar Library for Android.
- StateProgressBar - Android library to realize the various states and transitions in a ProgressBar.
JavaScript
- angular-loading-bar - A fully automatic loading / progress bar for your angular apps.
- Elastic Progress - Creates a button that turns into a progress bar with a elastic effect. Based on the Dribbble shot "Download" by xjw.
- Halogen - A collection of loading spinners with React.js.
- jquery-circle-progress - jQuery Plugin to draw animated circular progress bars.
- Ladda - Buttons with built-in loading indicators.
- MProgress.js - Material Progress—Google Material Design Progress linear bar. By using CSS3 and vanilla JavaScript.
- nanobar - Very lightweight progress bars. No jQuery.
- node-progress - Flexible ascii progress bar for Node.js.
- NProgress - For slim progress bars like on YouTube, Medium, etc.
- ProgressBar.js - Responsive and slick progress bars.
- progress-estimator - Logs a progress bar and estimation for how long a Promise will take to complete.
- ProgressJS - ProgressJs is a JavaScript and CSS3 library which help developers to create and manage progress bar for every objects on the page.
- vue-ellipse-progress - A Vue.js component to create beautiful animated circular progress bars (Demo).
- vue-progressbar - A lightweight progress bar for vue.
Kotlin
- Android CatLoadingView - Android CatLoadingView.
- CircularProgressBar - Create circular ProgressBar in Android ⭕.
- LoadingButtonAndroid - A button to substitute the ProgressDialog.
Objective-C
- MBCircularProgressBar - A circular, animatable & highly customizable progress bar from the Interface Builder (Objective-C).
- YLProgressBar - UIProgressView replacement with an highly and fully customizable animated progress bar in pure Core Graphics.
Python
- alive-progress :) - A new kind of Progress Bar, with real time throughput, eta and very cool animations!
- Easy progress reporting for Python - Easy to use progress bars for Python.
- fastprogress - Simple and flexible progress bar for Jupyter Notebook and console.
- tqdm - A Fast, Extensible Progress Bar for Python and CLI.
Ruby
- Ruby/ProgressBar - Ruby/ProgressBar is a text progress bar library for Ruby.
SVG
- SVG-Loaders - Loading icons and small animations built with pure SVG.
Swift
- BreakOutToRefresh - Play BreakOut while loading - A playable pull to refresh view using SpriteKit.
- FillableLoaders - Completely customizable progress based loaders drawn using custom CGPaths written in Swift.
- KYCircularProgress - Flexible progress bar written in Swift.
- LiquidLoader - Spinner loader components with liquid animation.
- LoaderUI - NVActivityIndicatorView implemented in SwiftUI.
- NVActivityIndicatorView - NVActivityIndicatorView is a collection of awesome loading animations.
- UICircularProgressRing - A circular progress bar for iOS written in Swift.
TypeScript
- NG Bootstrap - Angular powered Bootstrap widgets.
- React Spinners - A collection of loading spinner components for react.