I just have installed Nessus vulnerability scanner on my devuan , and i notice that after the instalation no icons were created on the menu to start the service or stop it , this is important not only for this app but also for many others apps that load many computer resources and you are not already working on it .
This topic was created for those that use a specific app for 1 or 2 hours and then does not use it on that day for many more hours ahead and want to kill the services of that app to save computer resources .

I created a script for start for each app , and another script for stop for each app and have put them on (/usr/local/sbin) directory .

In case of  nessus , the scripts are called "nessus-start" & "nessus-stop"
for nexpose i used the same principle , witch is "nexpose-start" and "nexpose-stop"

The script to start nessus

#!/bin/bash
service nessusd start
echo " Nessus service has started , reedirecting to nessus loginpage in 3 seconds"
sleep 3
open firefox "https://127.0.0.1:8834/"

this last script initiates nessus script and redirect the user to nessus login page witch is on localmacine "127.0.0.1" and the default port 8834 using https .

The script to stop nessus

#!/bin/bash
echo "Stopping Nessus service"
service nessusd stop
echo "Service stopped"
sleep 3s

NOTE: you can add the shortucts to the main menu using this other topic i created
https://dev1galaxy.org/viewtopic.php?id=124
but using this code for command :

sh -c "cd /usr/local/sbin && ./nessus-start;${SHELL:bash}"

with this code the shell window will close automatically after all commands are done in the script , but if you want the shell opened after the script finish , then use this code :

sh -c "cd /usr/local/sbin && ./nessus-start;${SHELL:-bash}"

For Nexpose the scripts are diffent because nexpose starts multiple services , (postgresql , couchdb , etc...) .

The script to start nexpose in case was made in its default instalation directory (the default is : /opt/rapid7/nexpose)

#!/bin/bash
echo " Starting Nexpose Service ,and redirecting you to nexpose login page https://127.0.0.1:3780"
echo "Nexpose services takes a minute to be operational , so refresh your browser in 1 minute"
service nexposeconsole start
sleep 4s
open firefox "https://127.0.0.1:3780/"
cd /opt/rapid7/nexpose/nsc && ./nsc.sh

Nexpose is a very heavy app that takes sometime to load , around here it takes 1 minute until i get access to web login interface , so that was the reason i left that message in the bash script o user reload the page in one minute , and i started a 4 seconds pause after that so user can read the message .

The script to stop nexpose services

#!/bin/bash
echo " Killing all processes related to nexpose"
service nexposeconsole stop
killall -u nxpgsql
kill $(ps aux | grep 'nsc.sh' | awk '{print $2}')

This stop script kills all processes related to username created by rapid 7 installation for services "nxpgsql" , and kills the active terminal window where startup script is running (that must not be closed) .

You should aldo install chkconfig tool to remove those boot services from boot startup

 apt-get install chkconfig

and issue the command on terminal :

chkconfig nessusd off && chkconfig nexposeconsole off

Note2: I believe that this topic is not much related to devuan normal users , however system administrators use this tools to check vulnerabilities on their servers before someone outside do some harm to company web services .
I also post it because i may need it in a few months or years and i may not remember at that time how did i do it.

As everyone already experienced , as long as times passes by and we install tools in our linux machine , if we do not use if often then will probably be forgotten its name from our mind , and after a few weeks we need to run that tool but we forgot its name .
So , the best thing is to add a launcher shortcut for it on our Devuan menu , so next time we do not need to start looking in OS where it is and what is its name .

The example i will give will be for a simple tool on github called ssh-audit , but this process can be made for any other tools you may want to add to your menu .

Link of the tool : https://github.com/arthepsy/ssh-audit

In my case i have cloned the tool to a specific directory i have in my system for that , but anyone can clone it to whatever place you want in your OS .
My example directory is in : /tools/ssh  directory
First of all go to your target directory where you want the tool to be cloned and issue the command :

git clone https://github.com/arthepsy/ssh-audit.git

like it is in the next image :

Next step is to test if tool is working or not , this is important because some tools need dependencies to run , but in this case this tool already its dependencies installed in my OS .

Ok , now that we see that the tool is does not have any issue on starting up , we need to test it on a real ip address to see if any error popup or not during the scan .

This ip i used was a random ip i found with port 22 opened .

Now that we can see the everything is working fine , we will add the tool to our Devuan XFCE4 menu .
To do that open the app in (Accessories/Main Menu)

After main menu is opened , click on "New Item" and this new window will popup :

In the Name field put your tool name , in this case "SSH-Audit"
on the command field put this next code :

sh -c "cd /tools/ssh/ssh-audit && ./ssh-audit.py -h;${SHELL:-bash}"

this code may change depending where you have your tool installed .
if you have for example your tool installed on this directory "/root/ssh-audit" , then the code must be :

sh -c "cd /root/ssh-audit && ./ssh-audit.py -h;${SHELL:-bash}"

the CD command tells the shell that will open to navigate to that directory , and the "&&" = to execute also the command ahead .
Witch is "./ssh-audit.py" .

Select also the option "Launch in Terminal" , because this tool is a terminal tool and not a graphical tool .

To add an icon to that tool , then click on the default image on the left , and select the image that you want to add to that shorcut from your OS .
by default , icons in linux are located in "/usr/share/icons" directory , but if you found a cool image on the web , then save that image to your Hard disk , and select its location and filename , like i did with this next image :

On this last window you see a big image because i selected an image from the web and not an icon , but the main menu tool will resize it when you save you new menu shortcut .

Press the button "OK" to save your new shortcut .

Now , if you open your Devuan Menu Again , you will see your new tool shortcut there  , like it is in my next image :

After this point , anytime you want to use your tool , everything you need to do is launch it from your Main menu shortcut , like it is in my next image :