Cisco:
https://www.cisco.com/c/en/us/products/visio-stencil-listing.html
Ну и суперкруть за супербабло:
https://www.visiostencils.com/VSSPurchase/purchase.aspx
Window 10 icons database
I’ve been searching for My Computer icon from Win 10 Tech Preview so long. W10 icons are the best ever created for Windows (some of the W98’s icons are on the 2nd place). Finally I’ve found great site with complete database of icons: https://icons.bav0.com/builds/