I've been watching this for decades and haven't seen
a tool set I want to bet my mask and wafer costs on,
nor any that have decent PDK support for any foundry
I want to use. MAGIC you may find some MOSIS support
for.
There is no such thing as a home project $$$ foundry.
You can get "bargain" multiproject access (a mere few
tens of thousands of dollars for a handful of bare dice
in the end) at some foundries but you have to work
that deal if MOSIS isn't setting it up for you. And often
this deal depends a lot on belief in future business.
Now, designing yet another op amp is one of the least
useful projects you could pick. Talk about an overserved,
hypersegmented market.
First, get real about whether this is ever going to get
real. If it's only educational than many half-capable
design tools would do. It's the backend (layout through
verification and, critically, database acceptance where
you will almost certainly be required to pass a Caliber
golden tapeout verification - and you can't afford a
Caliber seat, unless your hobby has a very rich uncle)
that will hang you up. Who did the work to make your
free tools run absolutely identical to the golden deck?
For that matter, who added the missing DRC/LVS
capability at all?
Electric is a kooky platform, its database fundamentals
are way different and its internal LVS depends on the
"arc" construct in layout which cannot be rebuilt for
streamed-in DBs. It's a one-way, forward-only, ticket.
You can't pull in a GDS file, touch it and reverify it.
LASI is/was another interesting tool set. It has at least
a DRC, and can put out a SPICE deck from layout so
you could use a SPICE:SPICE netlist equivalence LVS
(good luck finding one, open source). It may have not
added much modern foundry support but had some at
least.