With this script you can list all workflows on a csv file

$siteurl="http://site.domain.com"

$site=Get-SPSite("http://siteName");

#Initialize Workflow Count variable

$workflowcount = 0

#Foreach loop to loop through all webs, and lists with workflow associations, and exclude workflows that have previous versions and write findings to .csv file.

function Get-Workflows()

{

foreach($web in $site.AllWebs)

{

foreach($list in $web.Lists)

{

foreach($wf in $list.WorkflowAssociations)

{

if ($wf.Name -notlike "*Previous Version*")

{

$hash = @{"[url]"=$web.Url;"[List Name]"=$list.Title;"[Workflow]"=$wf.Name}

New-Object PSObject -Property $hash | Sort-Object

}

}

}

}

}

foreach($web in $site.AllWebs)

{

foreach($list in $web.Lists)

{

foreach($wf in $list.WorkflowAssociations)

{

if ($wf.Name -notlike "*Previous Version*")

{

$workflowcount += 1

}

}

}

}

Get-Workflows | Export-csv E:workflows.csv

"Workflow Count " + $workflowcount >> E:workflows.csv

$site.Dispose()

With this script you can list all workflows on a csv file

Take a look to https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.client.workflow.workflowassociation_members.aspx  to filter the information you need.

Thanks for providing the script. This is exactly what i was looking for. Also can you confirm how can we identify whether the workflow was created in SPD or it is Nintex workflow?

Regards,
Simran Sachdeva