Whilst Lightroom is one of the most popular applications, many (myself included) are not really a fan of the pay-to-use subscription model. I would must rather buy a piece of software and choose how and when to upgrade rather than to be locked into a piece of software.
With that in mind, there are a range of free and paid Lightroom alternatives I have listed below;
As you can see, there are plenty of options outside of Lightroom, most offering a free trial of the software. What is your favorite photo editing / DAM software?