<s>
Icarus	B-Application
Verilog	I-Application
is	O
an	O
implementation	O
of	O
the	O
Verilog	B-Language
hardware	O
description	O
language	O
compiler	O
that	O
generates	O
netlists	O
in	O
the	O
desired	O
format	O
(	O
EDIF	O
)	O
.	O
</s>
<s>
It	O
supports	O
the	O
1995	O
,	O
2001	O
and	O
2005	O
versions	O
of	O
the	O
standard	O
,	O
portions	O
of	O
SystemVerilog	B-Language
,	O
and	O
some	O
extensions	O
.	O
</s>
<s>
Icarus	B-Application
Verilog	I-Application
is	O
available	O
for	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
OpenSolaris	B-Operating_System
,	O
AIX	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
,	O
and	O
.	O
</s>
<s>
Released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
,	O
Icarus	B-Application
Verilog	I-Application
is	O
free	B-Application
software	I-Application
.	O
</s>
<s>
As	O
of	O
release	O
0.9	O
,	O
Icarus	O
is	O
composed	O
of	O
a	O
Verilog	B-Language
compiler	O
(	O
including	O
a	O
Verilog	B-Language
preprocessor	O
)	O
with	O
support	O
for	O
plug-in	O
backends	O
,	O
and	O
a	O
virtual	O
machine	O
that	O
simulates	O
the	O
design	O
.	O
</s>
<s>
Release	O
v10.0	O
,	O
besides	O
general	O
improvements	O
and	O
bug	O
fixes	O
,	O
added	O
preliminary	O
support	O
for	O
VHDL	B-Language
,	O
but	O
the	O
VHDL	B-Language
support	O
has	O
been	O
abandoned	O
as	O
of	O
2018	O
.	O
</s>
<s>
Not	O
even	O
the	O
author	O
quite	O
remembers	O
when	O
the	O
project	O
was	O
first	O
started	O
,	O
but	O
CVS	B-Application
records	O
go	O
back	O
to	O
1998	O
.	O
</s>
<s>
Icarus	B-Application
Verilog	I-Application
development	O
is	O
done	O
largely	O
by	O
the	O
sole	O
regular	O
author	O
,	O
Stephen	O
Williams	O
.	O
</s>
