alliance : Digital IC design tools (simulation, synthesis, place/route, etc...) ( https://soc-extras.lip6.fr/en/alliance-abstract-en/ )
balsa : The Balsa asynchronous synthesis system ( http://apt.cs.manchester.ac.uk/projects/tools/balsa/ )
cirkuit : An application to generate publication-ready figures ( http://wwwu.uni-klu.ac.at/magostin/cirkuit.html )
drawtiming : Command line tool for drawing timing diagrams ( http://drawtiming.sourceforge.net/index.html )
eagle : CadSoft EAGLE schematic and printed circuit board (PCB) layout editor ( http://www.cadsoft.de )
electric : Complete Electronic Design Automation (EDA) system that can handle many forms of circuit design ( https://www.gnu.org/software/electric/electric.html )
electronics-menu : Creates an \"Electronics\" desktop menu ( http://www.gpleda.org/ )
espresso-ab : POSIX compliant version of the espresso logic minimization tool ( http://www.cs.man.ac.uk/apt/projects/balsa/ )
fasthenry : Three dimensional inductance computation program, Whiteley Research version ( http://www.wrcad.com/freestuff.html )
fritzing : Electronic Design Automation ( http://fritzing.org/ )
gazebo : A 3D multiple robot simulator with dynamics ( http://gazebosim.org/ )
geda : GPL Electronic Design Automation (gEDA):gaf core package ( http://www.gpleda.org/ )
geda-suite : Metapackage which installs all the components required for a full-featured gEDA/gaf system ( http://www.geda.seul.org )
geda-xgsch2pcb : A graphical front-end for the gschem - pcb workflow ( http://www.gpleda.org )
gerbv : A RS-274X (Gerber) and NC drill (Excellon) file viewer ( http://gerbv.geda-project.org/ )
ghdl : Complete VHDL simulator using the GCC technology ( http://ghdl.free.fr )
gnetman : A GNU Netlist Manipulation Library ( http://sourceforge.net/projects/gnetman/ )
gnucap : GNUCap is the GNU Circuit Analysis Package ( http://www.gnucap.org/ )
gplcver : Verilog simulator ( http://sourceforge.net/projects/gplcver )
gresistor : Translate a resistor color codes into a readable value ( http://www.roroid.ro/index.php?option=com_content%26view=article%26id=1:gresistor%26catid=1:software-projects%26Itemid=2 )
gsmc : A GTK program for doing Smith Chart calculations ( http://www.qsl.net/ik5nax/ )
gspeakers : GTK based loudspeaker enclosure and crossovernetwork designer ( http://gspeakers.sourceforge.net/ )
gspiceui : GUI frontend for Ngspice and Gnucap ( http://www.geda.seul.org/tools/gspiceui/ )
gtkwave : A wave viewer for LXT, LXT2, VZT, GHW and standard Verilog VCD/EVCD files ( http://gtkwave.sourceforge.net/ )
gwave : Analog waveform viewer for SPICE-like simulations ( http://gwave.sourceforge.net )
irsim : IRSIM is a \"switch-level\" simulator ( http://opencircuitdesign.com/irsim/ )
iverilog : A Verilog simulation and synthesis tool ( http://iverilog.icarus.com/ )
kicad : Electronic Schematic and PCB design tools ( http://www.kicad-pcb.org )
klayout : Viewer and editor for GDS and OASIS integrated circuit layouts ( http://www.klayout.de/ )
linsmith : Smith charting program, mainly designed for educational use ( http://www.jcoppens.com/soft/linsmith/index.en.php )
magic : The VLSI design CAD tool ( http://www.opencircuitdesign.com/magic/index.html )
netgen : LVS tool (layout versus schematic comparison) ( http://www.opencircuitdesign.com/netgen/index.html )
ngspice : The Next Generation Spice (Electronic Circuit Simulator) ( http://ngspice.sourceforge.net )
oregano : Oregano is an application for schematic capture and simulation of electrical circuits ( https://github.com/marc-lorber/oregano )
osqoop : multi-platform open source software oscilloscope based on Qt 4 ( http://gitorious.org/osqoop/ )
pcb : GPL Electronic Design Automation: Printed Circuit Board editor ( http://www.gpleda.org/ )
petrify : Synthesize Petri nets into asynchronous circuits ( http://www.lsi.upc.edu/~jordicf/petrify/ )
plcedit : Qt4 notepad for PLC programming ( http://www.qt-apps.org/content/show.php/PLCEdit?content=78380 )
puff : microwave CAD software ( http://wwwhome.cs.utwente.nl/~ptdeboer/ham/puff/ )
pulseview : Qt based logic analyzer GUI for sigrok ( http://sigrok.org/wiki/PulseView )
qelectrotech : Qt4 application to design electric diagrams ( http://qelectrotech.org/ )
qucs : Quite Universal Circuit Simulator in Qt4 ( http://qucs.sourceforge.net/ )
sigrok-cli : Command-line client for the sigrok logic analyzer software ( http://sigrok.org/wiki/Sigrok-cli )
spice : general-purpose circuit simulation program ( http://bwrc.eecs.berkeley.edu/Classes/IcBook/SPICE/ )
splat : RF Signal Propagation, Loss, And Terrain analysis tool for the spectrum between 20 MHz and 20 GHz ( http://www.qsl.net/kd2bd/splat.html )
systemc : A C++ based modeling platform for VLSI and system-level co-design ( http://www.systemc.org/" elog "by registering on their Web site (${HOMEPAGE}). )
vbs : vbs - the Verilog Behavioral Simulator ( http://www.geda.seul.org/tools/vbs/index.html )
voacapl : HF propagation prediction tool ( http://www.qsl.net/hz1jw/voacapl/index.html )
xcircuit : Circuit drawing and schematic capture program ( http://opencircuitdesign.com/xcircuit )
xnec2c : A GTK+ graphical interactive version of nec2c ( http://www.qsl.net/5b4az/pages/nec2.html )
xoscope : Soundcard Oscilloscope for X ( http://xoscope.sourceforge.net )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gentoo
For Paludis use this rsync : rsync://gentoo.zugaina.org/gentoo-portage
If you have a problem : ycarus(-at-)zugaina.org