These are my recommended apps for image and video manipulations:
Image Compression
- ShortPixel — an excellent service that compresses all types of images
- ImageOptim — the best free mac image compression tool
Image Editing
- Photoscape X — an easy-to-use image editor — free and paid versions available
- Gimp — a free full feature image editor
Image Converting
- XnConvert — a free and reliable image converter
- Topaz AI Gigapixel — an app for enlarging small photos while preserving clarity
Video Downloading
- FreeTube — an open source desktop YouTube player built with privacy in mind
Video Converting
- Handbrake — a free video converter that supports many formats
Audio Converting
- Media Human Audio Converter — free audio converter for MacOS
Image Downloading
- DownloadThemAll — a Firefox add-on for loading multiple images (recently revived by a new developer)
- Download All Images — Chrome add-on for loading multiple images
