GeeTeeDee

A different task manager

XorTime

Manage your tasks and the time you spend on them

CreativeNotes

Create safe and organized notes for PC and Pocket PC

Flowkeeper

Manage to finish all your tasks on time

Pagico

Very functional task planner

RedNotebook

A personal diary with dozens of interesting options

NixNote

Open source version of Evernote

iQ-Notes

Create notes with ease and organize all your tasks

LeaderTask

Personal task organizer

Todoist

Create and complete task lists

CherryTree

Save your notes with this complete program

Efficient Lady's Organizer

Personal organizer focused towards women

Seacow

Integrate task and contact management

Simple Sticky Notes

Program to create notes and reminders

pin 'em up

The best software to create notes and reminders on your PC

Google Tasks

Control Google Tasks from your desktop

QQ International

The messaging application to communicate at global level

Telegram Messenger

Telegram's desktop client for Windows

WhatSender

Send multiple WhatsApp messages from your PC

Signal

Instant messaging and chat app that guarantees anonymity

Telefuel

Alternative Telegram client focused on productivity for PCs

Facebook Messenger

Chat with your contacts from your desktop

Windows Live Messenger

The departed Messenger by Microsoft

WA Web Plus

An extension to use WhatsApp Web with more functions

LINE

Instant messaging from your PC

IMVU

Instant messaging and chats in 3D environments

WhatsApp Messenger

The official version of WhatsApp for Windows

imo

Talk to your friends from your PC

Messenger for Desktop

Facebook Messenger on your Windows desktop

WhatsApp Viewer

Tool to view WhatsApp chats on PC

WeChat

The Windows version of the popular Chinese messaging app