(Not sure which subforum is the correct for this one...)
I've downloaded Fritzing. I don't see, among the parts, my L-298N H-bridge and neither the 4 pined ultrasound sensor. I've imported some Adafruit library, but nothing there, either.
Are these parts available, at all?
thnx 
If I were you, I would avoid Fritzing. Try Eagle or other free PCB/schematic software. Fritzing is not very versatile and the schematic portion is junk.
But, if you insist, Google is your only hope. Also try the the Fritzing site for parts.
Fritzing.org has a forum, that's the place to ask once you've checked out The Fritzing Parts Library
I think fritzing is useful for teaching, but wouldn't use it for my own purposes, circuit
diagrams are the language of electronics and the sooner you get to grips with them
the more your understanding will deepen.
For a free schematics tool with simulation ability, I recommend LTSpice.
LTspice Information Center | Analog Devices?
If you want to do PCB layout, KiCad.
www.kicad-pcb.org/?
Eagle gets my vote. Fritzing doesn't seem much better than a toy. I have not seen a good schematic created in fritzing.
CrossRoads:
Eagle gets my vote. Fritzing doesn't seem much better than a toy. I have not seen a good schematic created in fritzing.
I thought it only attempted to do wiring diagrams, not circuit diagrams - hence its
usefulness for teaching.
I don't see how showing wires connected to black boxes is useful. Without knowing what the pin you are connecting to does, the drawing is useless, forcing you to pull up datasheets to see what is what.
A real schematic will show the part, the pin #, and tell you what the pin does.
codlink:
If I were you, I would avoid Fritzing. Try Eagle or other free PCB/schematic software.
CrossRoads:
Eagle gets my vote. Fritzing doesn't seem much better than a toy. I have not seen a good schematic created in fritzing.
I did try Eagle (I still have it installed) but its use didn't appear very straight forward to me and I don't want to invest much time in learning such an application. I just need to draw a couple of schemes and be done with them. Fritzing is very easy to use: parts are on the right and you just drag and drop them and connect them on the spot. The schemes are very illustrative and easy to read by students (exactly like MarkT noted). The only drawback is that I cannot find the parts I need.
MarkT:
Fritzing.org has a forum, that's the place to ask once you've checked out http://fritzing.org/parts/
I did drop a question there, already, but then the forum struck me like being quiet and I thought I'll try it here, too, and indeed, I got all this useful feedback.
ralphd:
For a free schematics tool with simulation ability, I recommend LTSpice.
LTspice Information Center | Analog Devices?
If you want to do PCB layout, KiCad.
www.kicad-pcb.org/?
I'll give them a shot, too. Which one produces schemes close to the Fritzing look?
I'll give them a shot, too. Which one produces schemes close to the Fritzing look?
Not that I know of, but read what CrossRoads stated. Schematics are the best illustration anyone could ask for.
Some tutorials for Eagle:
https://www.sparkfun.com/tutorials/108
I will say that I used Fritzing before I used Eagle and after I found out the hard way that Fritzing was useless, I learned the basics of Eagle in a couple of days. After a week I had a PCB made from it. Trust us when we say that you are better off learning a real tool. Going from Fritzing to Eagle was hard. Learn Eagle first (or any CAD software).
If you have any questions about how to do something in Eagle, there are a lot of us that are proficient at it. Just post in the PCB design forum.
Since you advertise it so warmly, maybe I'll give it yet another shot. 
CrossRoads:
I don't see how showing wires connected to black boxes is useful. Without knowing what the pin you are connecting to does, the drawing is useless, forcing you to pull up datasheets to see what is what.
A real schematic will show the part, the pin #, and tell you what the pin does.
Not sure what you mean. I pick some random scheme found on the web. In my mind, this shows exactly the parts and the connections between them and it's very illustrative even better than the real thing. This is what I need.
Of all the software mentioned above, which is the closest to this result, besides Fritzing?
..Well, I just had a Uploader Full message and just deleted about 3 paragraphs of text.. Nice new forum we have here..
On your image, what pins are cathode and anode, if I had the LEDs in my hands. Same for the sensor.
On the image http://s19.postimg.org/tqvdaywn7/Arduino_Pro_Mini_schematic.jpg, do you see what CrossRoads is meaning by "I can see what every pin does?"
Yes, the "upload folder full" is getting to be a pain. The admins are busy converting things, operation should be back to normal soon.
codlink:
On your image, what pins are cathode and anode, if I had the LEDs in my hands. Same for the sensor.
I suppose you can place a "+" next to the cable, or some text, if you need to. The image you direct to is not what I need.
codlink:
On the image http://s19.postimg.org/tqvdaywn7/Arduino_Pro_Mini_schematic.jpg, do you see what CrossRoads is meaning by "I can see what every pin does?"
Mind you, I don't mean to say Fritzing is better than Eagle or any other software. Matter of fact, I tried them just today and I don't care to defend or criticize either of them. I do know what I need, though, and that is Fritzing-like schemes. I suppose I'll just have to look better for the parts I need.
I have checked that fritzing, yeah that is a forum. Some of the thread are pretty interesting to me.. Can any one help me to know more about 3D architectural rendering. Recently I have visited a profile of one CAD engineer and checked the project that he had done. But I am a newbie for that and I just want to know more about it. I have recently started by career in CAD. I didn't found right place to ask this questions in this platform so just asking. here
I have made some custom parts in fritzing. I found that the most straightforward thing was to write the .svg files by hand, quite time consuming but nothing overly complicated
