All in one (edit)
1) Cloudquery transforms your cloud infrastructure into SQL database for easy monitoring, governance and security.
https://github.com/cloudquery/cloudquery/
2) Multitenancy in ASP.NET Core – Simplest Way to achieve Multitenancy
https://codewithmukesh.com/blog/multitenancy-in-aspnet-core/
https://github.com/iammukeshm/multitenancy-aspnet-core/
3) .NET WebAPI Boilerplate
.NET WebAPI Boilerplate Template built with .NET 6.0. Incorporates the most essential Packages your projects will ever need. Follows Clean Architecture Principles.
https://fullstackhero.net/dotnet-webapi-boilerplate/
https://github.com/fullstackhero/dotnet-webapi-boilerplate
4) ASP.NET Core 3.1 Web API Quick Start
https://github.com/dustinwilcock/aspnetcore3.1-quickstart
5) Inventory CRUD REST Service using ASP.NET CORE with JWT Token Authentication
This repository contains the inventory management REST service, built with ASP.NET Core 3.1 and Entity Framework 3.1 to illustrate creating REST API to performing CRUD actions and, how to create JWT token and secure API.
https://www.syncfusion.com/blogs/post/how-to-build-crud-rest-apis-with-asp-net-core-3-1-and-entity-framework-core-create-jwt-tokens-and-secure-apis.aspx
https://github.com/SyncfusionExamples/inventory-management-rest-service-asp-dotnet-core
6) Flutter: Create a scheduling application using a Flutter event calendar
https://github.com/SyncfusionExamples/scheduling-events-flutter-calendar
7) GrapQL: Build a Basic GraphQL Server with ASP.NET Core and Entity Framework in 10 Minutes
https://thecloudblog.net/post/build-a-basic-graphql-server-with-asp.net-core-and-entity-framework-in-10-minutes/
https://github.com/gtechsltn/movie-reviews
8) Send Mail with Email Template
https://jasonwatmore.com/post/2020/07/15/aspnet-core-3-send-emails-via-smtp-with-mailkit
https://emailframe.work/
https://www.goodemailcode.com/email-code/template
9) Frontend: Useful Front-End Boilerplates And Starter Kits
https://www.smashingmagazine.com/2021/06/useful-frontend-boilerplates-starter-kits/
10) All-in-one Complete Modern Front-end Development Boilerplate for Starters
Modern Front-end Development Boilerplate
https://github.com/yashilanka/Modern-Web-Boilerplate
Easy to use, all-in-one starter boilerplate to develop, build and deploy your next web project
11) Boilerform is a little HTML and CSS boilerplate to take the pain away from working with forms.
Boilerform is a little HTML and CSS boilerplate to take the pain away from working with forms.
https://github.com/andy-piccalilli/boilerform
12) React-Boilerplate
A highly scalable, offline-first foundation with the best developer experience and a focus on performance and best practices.
https://github.com/react-boilerplate/react-boilerplate
13) React Starter Kit
React Starter Kit — front-end starter kit using React, Relay, GraphQL, and JAM stack architecture
14) Style-Guide
Style Guide:
+ http://styleguides.io/
+ http://bradfrost.github.io/style-guide-guide/
+ https://bjankord.github.io/Style-Guide-Boilerplate/
CSS: http://lesliefranke.com/files/reference/csscheatsheet.html
15) 8 Must-Know NuGet Packages for an ASP.NET Core Application
https://oz-code.com/blog/net-c-tips/8-must-know-nuget-packages-asp-net-core-application
16) StackShare
https://stackshare.io/
17) Developing SPAs with ASP.NET Core v3.0
https://www.dotnetcurry.com/aspnet-core/1525/angular-react-vuejs-svelte-spa-aspnet-core-3
https://www.infoq.com/articles/spa-asp-dotnet-core-3/
18) Frontend Development with ASP.NET Core
https://www.sitepoint.com/premium/books/front-end-development-with-asp-net-core-angular-and-bootstrap/
19) How to use IHttpClientFactory in ASP.NET Core
https://www.infoworld.com/article/3586176/how-to-use-ihttpclientfactory-in-aspnet-core.html
20) User-Role-Permission
https://www.thereformedprogrammer.net/a-better-way-to-handle-authorization-in-asp-net-core/
https://github.com/JonPSmith/PermissionAccessControl
21) Scaffolding
https://www.red-gate.com/simple-talk/development/dotnet-development/using-scaffolding-to-create-mvc-applications-with-visual-studio/
22) Code Generator
+ jHipster.NET (https://www.jhipster.tech/)
+ Telosys
23) Reporting
https://stimulsoft.com/
https://github.com/stimulsoft/Samples-ASP.NET-MVC-CSharp
24) SlickSafe (User Authentication System Based MVC, BootStrap3, WebAPI)
https://github.com/gtechsltn/SlickSafe
25) Open Source
https://github.com/besley
https://github.com/go2ismail
https://opensourcelibs.com/lib/bogus
https://opensourcelibs.com/lib/cs-to-ts
https://opensourcelibs.com/lib/slicksafe
https://opensourcelibs.com/lib/samples-net.core-mvc-csharp
https://opensourcelibs.com/lib/asp.net-core-2-mvc-crud-datatables-jquery-plugin