Get Active Features In A Site Collection

Create a ps1 extension file in a path in your local desktop. Change the highlighted part with your Site Collection.

Get - SPsite http: //hvsp01:10641 | %
{
$results = @()
Get - SPFeature - Limit All | %
{
$feature = $_;
$featuresDefn = (Get - SPFarm).FeatureDefinitions[$_.ID];
$cc = [System.Globalization.CultureInfo]::CurrentCulture;
$obj = New - Object PSObject;
$obj | Add - Member NoteProperty Title $($featuresDefn.GetTitle($cc));
$obj | Add - Member NoteProperty ID $($feature.ID);
$obj | Add - Member NoteProperty Scope $($feature.Scope);
$obj | Add - Member NoteProperty Hidden $($feature.Hidden);
$obj | Add - Member NoteProperty Description $($featuresDefn.GetDescription($cc));
$results += $obj;
}#
$results | FT - auto;
$results | Out - GridView;
}