user4949: What do you guys use for project designing?
I just found out about AutoDesk's 123D Circuits, which is nice but I wonder if there is something with more components, tools, etc?
For example, I can add an accelerometer to my project there but no signs of a LCD. I have been learning hardware recently and I feel there should be more complete tools out there.
I know this question may be opinion based but I could not find anywhere to ask. Thanks,

user3031: I think Fritzing is used quite a lot. I have used it myself a couple of times, and I felt it was quite comprehensive. But I haven't used it enough to say whether this is the tool to choose.

user7522: So, as the other users said, tou can use FRITZING, it is totally free and it does have LCD and a lot of other Shields. But the thing is, if you want a more complete design tool, PROTEUS 8.1 is a very used tool and by far more easy to use than any other design tool (as a complete designer solution). You can even simulate your lcd in software to test if everything is ok before start mounting your Circuit.
Proteus Site: http://www.labcenter.com/index.cfm
Proteus is not free but you can use a lot it.
Here's some images of arduinos in Proteus (The site in portuguese but you just need to see the pictures): 
http://microcontrolandos.blogspot.com.br/2013/04/proteus-8-professional.html

user11075: I am using KiCad. It's a full EDA/PCB design suite that is free. It's a really nice multi-platform package. It doesn't do circuit simulation(to my knowledge). It's relatively easy to learn via some youtube tutorials and there's a healthy development community and discussion board as well. It outputs industry standard gerber files so you can quote out your designs to pcb manufacturers.
link:
http://www.kicad.org/

4949: <p>What do you guys use for project designing?</p>

<p>I just found out about AutoDesk's 123D Circuits, which is nice but I wonder if there is something with more components, tools, etc?</p>

<p>For example, I can add an accelerometer to my project there but no signs of a LCD. I have been learning hardware recently and I feel there should be more complete tools out there.</p>

<p>I know this question may be opinion based but I could not find anywhere to ask. Thanks,</p>
 3031: <p>I think <a href="http://fritzing.org/home/" rel="nofollow">Fritzing</a> is used quite a lot. I have used it myself a couple of times, and I felt it was quite comprehensive. But I haven't used it enough to say whether this is <em>the</em> tool to choose.</p>
 7522: <p>So, as the other users said, tou can use FRITZING, it is totally free and it does have LCD and a lot of other Shields. But the thing is, if you want a more complete design tool, PROTEUS 8.1 is a very used tool and by far more easy to use than any other design tool (as a complete designer solution). You can even simulate your lcd in software to test if everything is ok before start mounting your Circuit.</p>

<p>Proteus Site: <a href="http://www.labcenter.com/index.cfm" rel="nofollow">http://www.labcenter.com/index.cfm</a></p>

<p>Proteus is not free but you can use a lot it.</p>

<p>Here's some images of arduinos in Proteus (The site in portuguese but you just need to see the pictures): 
<a href="http://microcontrolandos.blogspot.com.br/2013/04/proteus-8-professional.html" rel="nofollow">http://microcontrolandos.blogspot.com.br/2013/04/proteus-8-professional.html</a></p>
 11075: <p>I am using KiCad. It's a full EDA/PCB design suite that is <strong>free</strong>. It's a really nice multi-platform package. It doesn't do circuit simulation(to my knowledge). It's relatively easy to learn via some youtube tutorials and there's a healthy development community and discussion board as well. It outputs industry standard gerber files so you can quote out your designs to pcb manufacturers.</p>
<p>link:
<a href="http://www.kicad.org/" rel="nofollow noreferrer">http://www.kicad.org/</a></p>
