Starting with version (2018 Vol 2 Service Pack 1), Syncfusion components are now available as NuGet packages in

Syncfusion Essential Studio Windows Phone NuGet packages

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Windows Phone NuGet Packages

Syncfusion Windows Phone 8.1 NuGet Package
File Size: 17.30 MB | November 30, 2015
Syncfusion Windows Phone 8 NuGet Package
File Size: 6.20 MB | November 30, 2015