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    How To Use Nmap (Network Mapper) – A Comprehensive Guide: Basics To Advanced

    Danie van der Merwe · / gadgeteerza-tech-blog · 12:31

Nmap is a free and open-source network discovery and security audit tool. In simple terms, network discovery is the process of finding out the devices that are on the network. Whether you are a network engineer or a penetration tester, Nmap is one of the most important tools in your arsenal.

It can help show what devices are connected to your network, can scan what ports they have got open, and also glean some additional information about these devices (eg. those -sY and -O flags). If you suspect a neighbour is using your home network, then this is a tool that will show that connected device.

It runs on Linux, MacOS and Windows and this guide really covers all the basics including the background to IP addresses and ports and how a device connects to a network.


#technology #opensource #security #networkscanning #penetrationtesting

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    SonoBus is an open source cross-platform application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network

    Danie van der Merwe · / gadgeteerza-tech-blog · 2 days ago - 11:12

Connects multiple users together to send and receive audio among all in a group, with fine-grained control over latency, quality and overall mix. Includes optional input compression, noise gate, and EQ effects, along with a master reverb. All settings are dynamic, network statistics are clearly visible.

So this could be for a band or music practice, a meeting, etc without audio passing through any central server or reliant on any Internet service. Works as a standalone application on macOS, Windows, iOS, and GNU/Linux, and as an audio plugin (AU, VST, and AAX) on macOS and Windows. Use it on your desktop or in your DAW, or on your mobile device such as Android or iOS.


#technology #privacy #music #bandpractice #opensource

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    The Top 5 Open-Source Microsoft 365 (Cloud Based) Alternatives for Linux

    Danie van der Merwe · / gadgeteerza-tech-blog · 4 days ago - 21:20

It’s a well-known fact that Microsoft 365 is the default productivity solution for many companies and its range of features is truly impressive. It includes such functionalities as document editing, real-time collaboration, file sharing, project management, email, calendaring, and video conferencing. In other words, Microsoft 365 provides both personal and corporate users with all the essential applications that allow them to get their work done effortlessly and quickly.

However, the subscription model and cost of this software as well as its security standards and policies are not appropriate for everyone, and some companies start looking for more affordable solutions.

Personally I used Zimbra for a number of years in a corporate environment and must say it had a few features on the e-mail side that I did not see on Outlook mail (popups over dates to show appointments, click to make Skype calls, etc), and it's search through my 9 GB mailbox was way faster than Outlook. So don't think that open source is necessarily worse at everything.


#technology #opensource #alternativeto #collaboration

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    The Best 7 Free and Open Source Optometry Software Solutions

    Danie van der Merwe · / gadgeteerza-tech-blog · 4 days ago - 09:38

It is no secret that the latest technologies and practice trends are transforming the optometry industry recently. The traditional optometry management is no more in practice. Prevention, detection, and management are getting better day-by-day with advanced technologies and new software solutions. Automation is the new change.

With the help of the optometry software, the opticians and ophthalmologists can efficiently manage your precious eyes.

The following applications are covered along with a comparison sheet: * Filopto * OpenEyes * Wink * Apex EDI * Iris Mini * DrChrono (trial only) * OD Link (trial only) * RevolutionEHR


#technology #health #vision #opensource #optometry

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    Linux for Starters – How to Choose a Distro

    Danie van der Merwe · / gadgeteerza-tech-blog · 5 days ago - 11:53

You’ve decided that you want to try Linux but are unsure how to proceed. You are confused by the many hundreds of Linux distributions (distros) available. Which distro should you try?

There is no ‘perfect distribution’ and there isn’t a magical answer to the question. It’s a decision which will depend on your requirements and personal preferences. The best way to help is to focus on a few key considerations.

One thing to remember with Linux is that it is all running the same kernel under the hood so usually any Linux app will run on any Linux distro, and the differences come in with how the package managers work. So whichever distro you choose to start on, chances are you can install any app and can still customise that distro to do what you need.

This article discusses hardware considerations, beginner friendliness, point release vs rolling release distros. Their following article will discuss how to install a distro.


#technology #linux #opensource #distros #startinglinux

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    How to install DroidStar on iPhone and Windows to Rx/Tx on D-STAR, DMR, Fusion YSF/FCS, NXDN, P25, M17, and IAX (AllStar client) over UDP for Ham Radio digital modes

    Danie van der Merwe · / gadgeteerza-tech-blog · 5 days ago - 10:25

Android users have had the Droid-Star app for this purpose for quite a while but recently a beta version for iOS has surfaced which can be tried by ham radio operators on the iPhone. The video below takes you through the steps to install it via the Test Flight app.

Just to note for DMR you need to have also created (under SelfCare on the Brandmeister website in your Profile) a password by HotSpot security after enabling that setting. This password must be set inside this app's settings too. The Tx button is a toggle button so you need to kerchunk it (tap twice) to register in the Talk Group.

Interesting that this iOS version is a branch off the DUDE-Star Github project and that main branch can also compile to work on Linux, Raspberry Pi and MacOS (with Windows executable only downloads under Releases in the project). Windows install at


#technology #opensource #hamradio #DMR #iOS

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    Free and Open Source Eyes Guard for Windows - Because Taking a Break is best for Avoiding Eye Strain from long time in front of Screens

    Danie van der Merwe · / gadgeteerza-tech-blog · 5 days ago - 08:33

I've featured Safe Eyes for Linux before so this one is for Windows users. We read more and more about blue light filters (and it also being recently debunked) to avoid eye strain, but the most important preventions are taking forced breaks every 20 minutes, not sitting too close to the screen, having correct eye focus, and not having the brightness set too high.

Eyes Guard will allow you to enable forced breaks. Another good alternative for Windows (not open source) is called Eye Saver which in addition has anti flicker and blue light filter options too.


#technology #opensource #eyestrain #health #bluelightfilter

  • avestura/EyesGuard

    👀 Windows Application for protecting your eyes. Contribute to avestura/EyesGuard development by creating an account on GitHub.

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    The European Commission has funded an open source project to create a Gateway between the ActivityPub and XMPP PubSub Protocols, and E2EE on PubSub

    Danie van der Merwe · / gadgeteerza-tech-blog · 6 days ago - 08:20 · 1 minute

From goffi: "it's my pleasure to announce that an ActivityPub <=> XMPP gateway doubled with Pubsub end-to-end encryption project has been selected for a grant by NLNet/NGI0 Discovery Fund (with financial support from European Commission's Next Generation Internet programme)".

The XMPP <=> ActivityPub gateway will join two major open and decentralised protocols. In practice it will be a XMPP server component (usable with any server), and implement the ActivityPub server to server protocol (or "Federation Protocol"). On XMPP side, it will be mostly a Pubsub service (with some extra, like private messages converted to XMPP message stanza).

XMPP blogging (XEP-0277: Microblogging over XMPP) will be used, and thus any client supporting it will have access to ActivityPub publications (Libervia and Movim for instance). For features present in ActivityPub and not yet in XMPP, it is planned to propose protoXEPs (i.e. proposition of XMPP extensions), to implement them. Events will also be part of the project, with a compatibility between Mobilizon and Libervia expected, and a protoXEP to have this standardised on XMPP side.

This is quite exiting, as it will extend both networks, and boost projects integrating blogging and XMPP chat.


#technology #opensource #XMPP #ActivityPub #Fediverse