Open Software:
- FreePlane: Mind Maps;
- GThumb, Shotwell, Shutter: image viewers, each with their own strengths;
- Krita, Glimpse: image editing software, Photoshop like;
- pgAdmin4: PostgreSQL manager, including an ERD editor that generates SQL, very handy to design a database;
- Pomatez: useful timer, Pomodoro-like;
- Variety: versatile wallpaper manager.