A beautiful, fast and fully open source mail client for Mac, Windows and Linux. - Foundry376/Mailspring

Textual is a TUI framework for Python, inspired by modern web development.

Cache reference, mutex lock/unlock, disk seek, etc...

Restic is a modern backup program that can back up your files:

from Linux, BSD, Mac and Windows

to many different storage types, including self-hosted and online services

easily, being a single executable that you can run without a server or complex setup

effectively, only transferring the parts that actually changed in the files you back up

securely, by careful use of cryptography in every part of the process

verifiably, enabling you to make sure that your files can be restored when needed

freely - restic is entirely free to use and completely open source

GUI analyzer for deep-diving into PDF files. Detect malicious payloads, understand object relationships, and extract key information for threat analysis. - seekbytes/IPA

SmokePing is a deluxe latency measurement tool. It can measure, store and display latency, latency distribution and packet loss. SmokePing uses RRDtool to maintain a longterm data-store and to draw pretty graphs, giving up to the minute information on the state of each network connection.