SmartFormat is a string composition library written in C# which is basically compatible with string.Format. More than that SmartFormat can format data with named placeholders, lists, pluralization and other smart extensions.
There is a Nuget Package which can be installed with
Install-Package SmartFormat.NET
See further information on the wiki.
See changelog for changes.
Projects, where SmartFormat.Net is used: (let us know if you'd like to be listed here):
MailMergeLib is an SMTP mail client library which provides comfortable mail merge capabilities for text, inline images and attachments, as well as good throughput and fault tolerance for sending mail messages.