Me too, they've been updating and maintaining this wide array of apps for longer than I've consciously sought open-source. It's a shame they've discontinued Open Camera, but their suite is still very impressive, and they likely work under the same thankless conditions as any developer of free apps. Lead Dev has a Patreon, and if you use a few of their apps, and appreciate their continued existence, it could be worth a regular pay-what-you-can-esque contribution.