JDownloader 2 is a legitimate, open-source download manager that supports thousands of hosts. While it does not exclusively label itself a "Bunkr downloader," it often works with Bunkr links by analyzing deep URLs.
Tools like Download All Images or Video DownloadHelper can often "sniff" the media files on a Bunkr page, allowing you to select and download them in one go without manual scripts. Bunkr.la Album Downloader
While Bunkr.la Album Downloader is a popular option, there are other alternatives available: JDownloader 2 is a legitimate, open-source download manager