Snapseed

This is actually quite a range of paid-for and free DAM software already out there right now. It might be an idea to look at the DAM suggestions and reviews on photography websites and then try out some of the products to see which ones best suit your own needs. It also might be with looking at photography channels on Youtube too, e.g. J Cristina etc, to see what options they recommend.

It would be an awful lot of effort to do that in what is already a crowded market so I suspect that the prospects are very remote.

Unfortunately, there are still significant issues with those options. What I suggest is that if someone is determined to run Affinity Photo on Linux then they download the free VirtualBox or VMware Workstation Player virtual machine software, install a Windows operation system in that virtual machine and then buy and install Affinity Photo. There are plenty of video tutorials out there on how to do things like this. If someone really wants to use Wine/PlayOn Linux/Crossover then by all means try out PhotoScape, PaintShop Pro or PhotoLine 21 (this one seems to generally work very well with Wine). Finally, the pixls.us website covers free and open source photography and try looking there for information about other native Linux image editors.

@Noel, in which case, it might be possible to turn it into a cross platform Electron app like Visual Studio Code from Microsoft.

@Renzatic, I fully agree that there's money to be made from the Linux platform. For example, I will readily buy good software such as SoftMaker Office and Pixeluvo to run on my Ubuntu Mate PC.

@Patrick, Joe Cristina's 'Cutting the Cord' series of videos have turned out to be immensely popular generating thousands of extra subscribers and tens of thousands of extra views. In other words, it has turned out to be a goose that lays golden eggs so my money is definitely on Joe Cristina not going back to a certain cloudy service. While I am here, and if I may, I have a constructive suggestion to make. At the current time, it is wholly uneconomic to port Affinity Photo over to Linux. However, I think it is worth one of your Windows developers initiating a discreet discussion with the developers at CodeWeavers (the makers of CrossOver) to see what potential steps are required to make Affinity Photo Crossover and Wine-friendly. If a significant code rewrite is required then it's not worth doing but if it turns out that only some modest adjustments are required then it probably is worth doing. Affinity Photo can then be marketed as being for Windows, macOS and Linux with Wine/Crossover which will also hopefully be end of threads like this one.

@Patrick, if you haven't already, I suggest that you check out photographer Joe Cristina's YouTube channel where he's currently doing a series of "Cutting the Cord" videos about options for migrating away from a certain cloudy service provider. I think they are both informative and entertaining videos and the Affinity products do rather well.

@OS1, there are quite a few competent RAW image processors for Linux, three desktop publishing softwares that I know of and quite a few native photo/image editors including, but not limited to, Pixeluvo, Fotoxx, PhotoFlare, PencilSheep, Nomacs, Krita and so on. I don't think the Linux situation is entirely bleak and it's much better than it used to be.

@SrPx, quite a few Chromebooks can now run Linux apps and for those that can't there's Crouton to help out there. A few of the online image editors are quite good and can be accessed by Chromebooks (Photopea, Pixlr, Sumopaint, etc).

@Merde, the short answer is a complete stuff up by Netmarketshare who noticeably overestimated the Linux market share (I suspect a change in measuring parameters/algorithms). They then compounded the issue by changing things and underestimating the Linux market share.

@OS1, I agree and the best that can be hoped for is that Serif would at least look into the practicality of making the rather good Affinity products work well with Wine.

@Eric5, you could check out any/all of DarkTable, RawTherapee and LightZone, try them out and go with the one that works best for you. I should add that they are all free and cross platform.

@Arte, I agree with what you said. I also think it's better that Serif concentrate on the development of Designer, Photo and Publisher at present rather than go down the routes of DAM and Lightroom softwares not least because those two markets are already pretty crowded with many existing competent options.

@Michael, I am pleased to report that VivaDesigner is also another worthy alternative to Scribus. I should none of the Linux software l suggest is in any way a direct competitor to any of the very good Affinity products because Serif doesn't currently provide any products that are either Linux or Wine-friendly.

@spacedrone808, I'm a Linux user and if you look through my posting history you'll see what l personally use (not GIMP) and what l suggest trying with Wine.