Pretty good apps..
Can vouch for Waltr 2, DaisyDisk and Gemini as I have used them recently.
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PDF Expert 2
PDF Expert is a fast, robust and beautiful PDF editor for your Mac.
PDF Expert is your best companion for any PDF related task. Easily read and mark-up your text notes, fill out and sign PDF forms, edit existing text, images and even links. With over 200,000 users PDF Expert, won major Apple awards such as Editor’s Choice & App of the Year. Easily read, edit, merge, sign, and fill out forms—no wonder it won “App of the Year Runner-Up” from Apple in 2015.
Gemini 2
Gemini 2 will Find duplicate files and wipe them away off your Mac.
The 2017 Red Dot Design Award Winner for Best User Interface, Gemini 2 for Mac is smart, laser accurate, and recovers tons of space on your Mac. It learns what you delete and what you choose to keep to continually improve the cleaning process. Plus, it offers an extra layer of security by moving duplicates to the Trash, so you can bring them back in a click if you find yourself deleting the wrong files.
DaisyDisk
DaisyDisk is a top-rated declutter utility that will find space-hogging files to delete from your Mac.
DaisyDisk is an easy, elegant way to do a little spring-cleaning on your Mac. No matter the season, the app makes quick work of clearing away documents, photos, downloads, and other files that have piled up over time. DaisyDisk works with external hard drives and USB sticks, too. Plug one into your Mac, and DaisyDisk will offer to scan it. Whether you’re looking to eradicate gigabytes of forgotten .dmg files or just want to keep your Documents folder tidy, DaisyDisk is one of the more polished utilities for the job. No wonder Apple features it all the time!
WALTR 2
Drag & Drop any music, video, ringtone, PDF or ePub from Mac into iPhone or iPad without iTunes (& no extra apps).
If you want to move a file, whether it's a video, ebook, ringtone, or other media file, from your Mac to your iPhone, you'd usually need to use iTunes. Critically-acclaimed WALTR 2 allows you to skip converters, iTunes, and wires altogether. At its core, WALTR 2 is a simple file manager where you can drag-and-drop any music, ringtones, videos, PDF, and ePUB files into any Apple device without iTunes or external apps. As a bonus, WALTR 2 goes beyond iOS devices, supporting the entire lineup of Apple iPods, starting with the original iPod Classic, built in 2001.
Includes support for…
Video formats: MKV, AVI, MP4, MOV, MPEG, M2TS, 3GP, WMV, H264, H265;
Audio formats: MP3, FLAC, APE, ALAC, AAC, AIFF, WAV, WMA, OGG, OGA, WV, TTA, DFF;
Photolemur 3
Automatically make your photos beautiful with the help of artificial intelligence.
Running any image through a program like Photoshop always takes forever, which is why , the 2018 Red Dot Design Award Winner for Best User Interface, Photolemur 3 will analyze and adjust stuff like color recovery, sky enhancement, exposure compensation, smart de-haze all by itself. Photolemur allows you to drag in your image, then sit back as the Mac app does your heavy lifting.
No couples sliders. No waste of time. No complex learning. Photolemur 3 for Mac provides flawless raw support and picture perfect enhancement in seconds.
Whichever way I counted, there are only 5 apps. Where is the sixth app?