| 16-bit CPU based loosely on Caxton Foster's Blue architecture |  | Stats | | LGPL | |
| 32 bit Processor | | Stats | | LGPL | |
| 4004 CPU and MCS-4 family chips | | Stats | | Others | |
| 6809 and 6309 Compatible core | | Stats | | LGPL | |
| 8-BIT HARDWIRED PROCESSOR | | Stats | | LGPL | |
| 8-BIT MICROPROGRAMMED PROCESSOR | | Stats | | LGPL | |
| 8080 Compatible CPU | | Stats | | | |
| A lightweight 8085 verilog implementation |  | Stats | | LGPL | |
| A-Z80 CPU | | Stats | | LGPL | |
| ae18 | | Stats | | LGPL | |
| aeMB | | Stats | | LGPL | |
| ag_6502 soft core with phase-level accuracy | | Stats | | GPL | |
| AltOr32 - Alternative Lightweight OpenRisc CPU | | Stats | | LGPL | |
 Amber ARM-compatible core | | Stats | | LGPL | |
| ao486 | | Stats | | BSD | |
| ao68000 - Wishbone 68000 core | | Stats | | BSD | |
| aoR3000 | | Stats | | BSD | |
| Aquarius | | Stats | | GPL | |
| Attiny Atmega Xmega core | | Stats | | LGPL | |
| BiRiscV - 32-bit dual issue RISC-V CPU | | Stats | | Others | |
| Brainfuck CPU | | Stats | | LGPL | |
| CBU Graduation Project | | Stats | | LGPL | |
| ClaiRISC - runs 12bit opcode PIC family. | | Stats | | | |
| Classic 5-Stage Pipeline MIPS | | Stats | | BSD | |
| DarkRISCV | | Stats | | BSD | |
| ecpu_alu | | Stats | | GPL | |
| Edge Processor (MIPS) | | Stats | | LGPL | |
| Educational 16-bit MIPS Processor | | Stats | | LGPL | |
| Educational RISC Processor | | Stats | | | |
| ELM Embedded Processor | | Stats | | Others | |
| erm16 | | Stats | | LGPL | |
| Featherweight RISC-V | | Stats | | Others | |
| Fluid Core (A Reconfigurable Pipelined RISC processor) | | Stats | | LGPL | |
| ForwardCom | | Stats | | CERN-OHL-L | |
| HD63701 compatible core | | Stats | | LGPL | |
| HIVE - a 32 bit, 8 thread, 4 register/stack hybrid, pipelined verilog soft processor core | | Stats | | Others | |
| i650 | | Stats | | LGPL | |
| K68 | | Stats | | | |
| KLC32 | | Stats | | LGPL | |
| M1 Core | | Stats | | GPL | |
| M32632 32-bit Processor | | Stats | | LGPL | |
| M65C02 | | Stats | | LGPL | |
| MC6803/6801 CPU | | Stats | | LGPL | |
| Mini-Risc core | | Stats | | | |
| MIPS32 Release 1 | | Stats | | LGPL | |
| MIPS32 Release 1 with support for FPU and other COPs | | Stats | | LGPL | |
| mips789 | | Stats | | | |
| MIX-fpga | | Stats | | GPL | |
| MMU for Z80 and eZ80 | | Stats | | BSD | |
| MPX 32-bit CPU | | Stats | | LGPL | |
| Natalius 8 bit RISC | | Stats | | LGPL | |
| Navré AVR clone (8-bit RISC) | | Stats | | GPL | |
| nCore | | Stats | | GPL | |
| Next 80186 processor | | Stats | | LGPL | |
| NextZ80 | | Stats | | LGPL | |
| ODESS Multicore Project | | Stats | | LGPL | |
| oks8 | | Stats | | GPL | |
| OoOPs - Out-of-Order MIPS (TM) Processor | | Stats | | LGPL | |
| OpenFire Processor Core | | Stats | | | |
| openMSP430 | | Stats | | BSD | |
| OpenRISC 1000 | | Stats | | LGPL | |
| OpenRISC 1000 (old) | | Stats | | LGPL | |
| OpenRisc 1200 HP, Hyper Pipelined OR1200 Core | | Stats | | LGPL | |
| OpenRISC 2000 | | Stats | | LGPL | |
| OpenRV64 | | Stats | | CERN-OHL2-P | |
| P16C5x | | Stats | | LGPL | |
| Pepelatz MISC | | Stats | | LGPL | |
| Pipelined 32-bit RISC-V (RV32IM) Processor | | Stats | | LGPL | |
| qrisc32 wishbone compatible risc core | | Stats | | LGPL | |
| r2000 Soc | | Stats | | LGPL | |
| Raptor64 | | Stats | | LGPL | |
| Reduced AVR Core for CPLD | | Stats | | LGPL | |
| rf68000 | | Stats | | BSD | |
| rf6809 8/12 bit | | Stats | | BSD | B.3 |
| risc16f84 | | Stats | | Others | |
| RTF65002 | | Stats | | LGPL | |
| rtf8088 | | Stats | | LGPL | |
| S1 Core | | Stats | | GPL | |
| S80186 | | Stats | | GPL | |
| SAP-1 NANOPROGRAMMED PROCESSOR | | Stats | | LGPL | |
| SAP-1 VERTICAL MICROPROGRAMMED PROCESSOR | | Stats | | LGPL | |
| SAYEH educational processor | | Stats | | LGPL | |
| small non-pipelined, 3 stage 16-bit cpu (fetch,decode,execute) | | Stats | | LGPL | |
| Small Stack Based Computer Compiler | | Stats | | Others | |
| Small x86 subset core | | Stats | | LGPL | |
| Soft AVR Core + Interfaces | | Stats | | LGPL | |
| Steel Core | | Stats | | Others | |
| T6507LP | | Stats | | GPL | |
| Theia: ray graphic processing unit | | Stats | | GPL | |
| Thor Superscaler | | Stats | | LGPL | |
| TMS1000 | | Stats | | LGPL | |
| TotalCPU | | Stats | | | |
| Trinary CPU "Typhoon" | | Stats | | GPL | |
| turbo 8051 | | Stats | | LGPL | |
| TV80 | | Stats | | BSD | |
| UCore | | Stats | | | |
| uRisc-V | | Stats | | Others | |
| v586 | | Stats | | BSD | |
| VTACH - Bell Labs CARDIAC reimagined in Verilog | | Stats | | LGPL | |
| Wishbone High Performance Z80 | | Stats | | | |
| Y80e - Z80/Z180 compatible processor extended by eZ80 instructions | | Stats | | BSD | |
| YACC-Yet Another CPU CPU | | Stats | | | |
| Z3 - The Zork CPU | | Stats | | BSD | |
| Zet - The x86 (IA-32) open implementation | | Stats | | GPL | |
| Zip Cpu | | Stats | | GPL | B.4 |
