Plank Dock, look nice. Great job from developer...

plank

Elegant, simple, clean dock

Plank is a dock enabling you to start applications and manage your windows.
KeePassX Main Window

keepassx

Cross Platform Password Manager (empty transitional package)

This is a transitional package to install the keepassxc package and can be safely removed.
Ubuntu Software Center App Reviews

software-center

Utility for browsing, installing, and removing software

Document (PostScript, PDF) viewer

evince

Document (PostScript, PDF) viewer

Evince is a simple multi-page document viewer. It can display and print PostScript (PS), Encapsulated PostScript (EPS), DjVu, DVI, Portable Document Format (PDF) and XML Paper Specification (XPS) files. When supported by the document, it also allows searching for text, copying text to the clipboard, hypertext navigation, and table-of-contents bookmarks.
web browser

chromium

web browser

Web browser that aims to build a safer, faster, and more stable internet browsing experience.
Multiplayer infinite-world block sandbox

minetest

Multiplayer infinite-world block sandbox

Minetest is a minecraft-inspired game written from scratch and licensed under the LGPL (version 2.1 or later). It supports both survival and creative modes along with multiplayer support, dynamic lighting, and an "infinite" map generator.