.NET
- AutoMapper: object mapping
- Castle Windsor: dependency Injection
- Common Logging: logging infrastructure
- DotNetZip: Zip/Unzip
- EPPlus: read/write .xlsx files
- FakeIt Easy
- Fluent Extensions: TDD/BDD extension methods
- log4net: logging framework
- Moq: mock objects for TDD/BDD
- NPOI: read/write .doc/.xls/.ppt files
- iTextSharp: PDF generation
- PDFSharp: PDF generation
- Image Tools for Silverlight: image manipulation and render
- NUnit: unit testing framework
- SharpZip: Zip, GZip, Tar and BZip2
- TopShelf: helper for building Windows Services
Java
- Apache Commons
- DropWizard
- Guava
- Jackson
- Mockito
- REST Assured
- WireMock
JavaScript
- jQuery :)
- MediaElement.js: video player embed