I've recently started to hear about a new software from some colleagues. Luminar, this is the name, seems to be a very interesting product, which offers the ease of use of Lightroom with many more tools. As soon as will be released a Windows version, the operating system I use, I will present you a review.
Digikam is an open source, multi-platform photo organizer. It could be a useful alternative to Lightroom or ACDsee, if used in conjunction with a photo editor.
Some rumors and a preview video on Youtube seem to confirm a a completely redesigned version of the software but, for now, nothing interesting for photographers. https://www.youtube.com/watch?v=o6TfhWY6WoI&feature=youtu.be