Sooner or later you need to digitally sign a document. If you have never done it before it’s only a matter of time, you will need a digital signing service sooner than you can imagine. The problem is represented to be ready without being obliged to spend money for it.
You will find different offers online and many trusty companies will try to convince you that their offer its the best but many of them limit your possibility to freely sign documents when you really need.
During my tests I tried a bunch of them and, for my experience, just few worth any attention.
In particular I was positively impressed by hellosign and Adobe Echo Sign. They are both interesting but hellosign offers something more. I mean you have not to spend a cent for both but Abobe limits the number of documents you can free sign to just 5 documents each month. If you are not used to digitally sign your docs this limitation doesn’t represent a problem but, trust me, when you will begin you soon need more than 5 free signatures a month.
HelloSign also allows you to upload an image file with your handwritten (and, of course, scanned) signature or create a new one choosing between some different fonts. You have no limits for signing documents but you can send only three signature requests a month (enough for my present necessities). Moreover, you can browse into the hellosign Documents folder and find all the documents you have signed before.
On the other hand, Adobe Echo Sign request more personal information when you sign-up for the service and, as we already underlined, it limits your experience to just 5 activities a month.
Try them and let us know if you have already found a better, free, online service to digitally sign your documents. Good luck! 
Several open source tools have evolved in the past and have become popular with the developers too. These tools have gained popularity not only because they come free but because of the ease to work with and the features. First let us see some code editors:
On 
Installing software on 
What about losing your laptop? Obviously the chances to find it and have it back are very few! But there are several software you can install on your laptop to trace the ip and geo-location of te laptop and with a bit of fortune you could find it. 
Hace unos días he encontrado esta nueva aplicación para Linux, se llama CLI Companion. Aunque Linux ha evolucionado muchísimo y hay que reconocer que ya casi no hace falta hacer uso de la Consola para ejecutar programas y tareas varias, pero también hay veces que gracias al uso de la Consola se puede solucionar pequeños problema que de otra forma seria bastante mas complicado. En esos casos CliCompanion nos hecha una mano añadiendo una lista con diferentes comandos junto a nuestro terminal. La lista de los comando no es infinita, viene con unos cuantos; para cada comando hay una referencia donde se explica la función, también es posible añadir comandos y los parámetros correspondientes. Además CliCompanion tiene un apartado de búsqueda donde es posible encontrar el comando que mas nos interese en cada momento. Desde cuando lo instalé en mi Kubuntu 10.04, tengo que confirmar que es una muy buena aplicación y puede ser instalada con lo repositorios correspondientes y tener futuras actualizaciones o directamente através el paquete .DEB. Os dejo el enlace de la Web: 
Computer Borders 