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Software · Consoles, homebrew & emulation

RARS

RISC-V Assembler and Runtime Simulator.

  • Completely free
  • Linux
  • Open source

Overview

Features described in its Flathub listing and in its GitHub repository: debugging.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Support for debugging using breakpoints and/or” — GitHub, 10 November 2026

At a glance

All of RARS is free: no feature is locked behind a paid plan, and its code is open.

Its licence (MIT) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • Commercial use allowed

About

RARS, the RISC-V Assembler, Simulator, and Runtime, will assemble and simulate the execution of RISC-V assembly language programs. Its primary goal is to be an effective development environment for people getting started with RISC-V. Features: - RISC-V IMFDN Base (riscv32 and riscv64) - Several system calls that match behaviour from MARS or SPIKE. - Support for debugging using breakpoints and/or ebreak - Side by side comparison from psuedo-instruction to machine code with intermediate steps - Multifile assembly using either files open or a directory Environment Variables: - RARS_JAVA (Default: none): Passes arguments directly to the Java command (Will override other environment variables) - RARS_SCALE (Default: Screen width / 1920): Sets the sun.java2d.uiScale property (See documentation at https://news.kynosarges.org/2019/03/24/swing-high-dpi-properties/)

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 7 November 2026
  • Description from Flathub — AppStream (Flathub)

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