Microsoft Supported & Community Downloads for IIS...
Microsoft downloads are fully supported with future updates, bug fixes and customer support. Community downloads are submitted by IIS community members and do not benefit from Microsoft approval or support, and should be downloaded with this in mind.
Windows Cache Extension for PHP is a PHP accelerator that is used to increase the speed of PHP applications running on Windows and Windows Server. Once the Windows Cache Extension for PHP is enabled and loaded by the PHP engine, PHP applications can take advantage of the functionality without any code modifications.
IIS Application Initialization for IIS 7.5 enables website administrators to improve the responsiveness of their Web sites by loading the Web applications before the first request arrives. By proactively loading and initializing all the dependencies such as database connections, compilation of ASP.NET code, and loading of modules, IT Professionals can ensure their Web sites are responsive at all times even if their Web sites use a custom request pipeline or if the Application Pool is recycled...
IIS Application Request Routing (ARR) 3 enables Web server administrators, hosting providers, and Content Delivery Networks (CDNs) to increase Web application scalability and reliability through rule-based routing, client and host name affinity, load balancing of HTTP server requests, and distributed disk caching. With ARR, administrators can optimize resource utilization for application servers to reduce management costs for Web server farms and shared hosting environments.
This Compression Scheme Plugin exposes Google's Brotli encoding library to the IIS built-in Static and Dynamic Compression Modules. This plugin requires no additional licensing and is free for all users.
Brotli is a new compression algorith developed by Google. The smaller compressed response sizes allows for better space utilization and faster page loads. Brotli is able to outperform gzip in many situations. Current browser support is listed here. IIS Brotli automatically applies Brotli compression to IIS responses when applicable.
The ISAPI SCGI extension adds support for the Simple Common Gateway Interface protocol to IIS. SCGI is a standard for communicating between web servers and application servers on the back end offering similar benefits to FastCGI but significantly simpler.