I visited some but not all SPICE and Fast SPICE suppliers at DAC in San Diego this year. Here's a quick trip report.
FineSim (SPICE) is parallel.
FIneSim PRO (Fast SPICE) is also parallel and unique. Has a feature to abstract transistors into gate-level black box for digital logic.
Strategy - throw your entire SPICE netlist into this simulator and use up lots of CPUs.
Lacking - customer success stories. PRO is still a flat simulator. No language integration.
Contact - KT Moore
AuSIM (Fast SPICE) is hierarchical and now parallel. Their booth theatre was a hoot and they attracted full audiences to collect cool rocket toys.
Strategy - simulate flat or hierarchical designs on one or multiple CPUs.
Lacking - first customer success story. Language integration.
Contact - Dino Caporossi
ADiT (Fast SPICE) is flat and integrated with language simulators for both digital and AMS. Maybe next year they will be parallel.
Eldo (SPICE) is mature.
Strategy - simulate analog transistors with Eldo, digital transistors with ADiT and use digital or AMS language for the rest of your SoC.
Lacking - no hierarchy, learning curve for AMS language.
Contact - Cyril Descleves
HSIM (Fast SPICE) is hierarchical and the marketing gorilla. New for this year is the XA engine which offers SPICE accuracy.
HSPICE (SPICE) - Mature.
Strategy - flat designs simulate in NanoSim, hierarchical designs in HSIM.
Lacking - parallel simulation, why offer both HSIM and NanoSim?
Contact - Mike Demler
UltraSim (Fast SPICE) - couldn't find it at DAC!
Spectre (SPICE) - mature.
Strategy - hierarchical simulator stand-alone or with AMS languages.
Lacking - recent customer success stories, not parallel yet.
Xoomsys - Not a SPICE or Fast SPICE simulator but enables you to use a compute farm with existing SPICE simulators.
Strategy - put all those HSPICE licenses to work on long running jobs to improve run times.
Lacking - first customer success story.
Contact: Anjaneya Thakar
Summary - To tackle big transistor-level designs or long runs requires a circuit simulator to adopt some new techniques, like: Fast SPICE, hierarchy, multiple CPUs or mixed AMS languages. Most suppliers use one or two of these techniques. Synopsys, Cadence and Mentor are the most mature product choices.
EDA Marketing Consultant