Add Netsleuth (#261)

README.md

@@ -48,6 +48,7 @@
   - [Chat, VoIP, and Phone](#chat-voip-and-phone)
   - [Email](#email)
   - [File Sharing](#file-sharing)
+  - [Network Configuration](#network-configuration)
   - [Network Monitoring](#network-monitoring)
   - [News/Feed Readers](#newsfeed-readers)
   - [Proxy](#proxy)
@@ -406,6 +407,10 @@ this list aims to be broader and include apps from various other ecosystems in v
 
 [magic-wormhole]: https://github.com/warner/magic-wormhole
 
+### Network Configuration
+
+- [Netsleuth](https://github.com/vmkspv/netsleuth) - Utility for the calculation and analysis of IP subnet values, designed to simplify network configuration tasks `#python` `#gtk4` `#libadwaita`.
+
 ### Network Monitoring
 
 - [Echo](https://flathub.org/apps/io.github.lo2dev.Echo) - Simple utility to ping websites `#python` `#gtk4` `#libadwaita`.