Fix Windows: free diagnostic and maintenance tools
These free tools help you understand and fix a slow or unstable Windows: hardware diagnostics, startup programs, clean-up, system information. All are downloaded from their official site.
Data as of 9 November 2026 · 30 resources selected, all published after their official site and free status were verified at a reliable source.
Quick answer
Fix Windows: free diagnostic and maintenance tools
| Resource | Pricing | License | Commercial use | Account required | Checked on |
|---|---|---|---|---|---|
| Fedora Media Writer | Completely free | GPL-2.0-or-later | Yes | No | 5 November 2026 |
| Filelight | Completely free | GPL-2.0-or-later | Yes | No | 5 November 2026 |
| Fan Control | Completely free | GPL-3.0-only | Yes | No | 5 November 2026 |
| FurMark | Completely free | Proprietary | Not verified | No | 6 November 2026 |
| BleachBit | Completely free | GPL-3.0-only | Yes | No | 6 November 2026 |
| OpenTabletDriver | Completely free | LGPL-3.0-or-later | Yes | No | 5 November 2026 |
| Prunr | Completely free | MIT | Yes | Not verified | 7 November 2026 |
| aiseesoft-unlocker | Completely free | MIT | Yes | No | 9 November 2026 |
| OxMgr | Completely free | MIT | Yes | No | 6 November 2026 |
| AetherSDR | Completely free | GPL-3.0 | Yes | No | 9 November 2026 |
| Quitter: Habit Tracker | Completely free | MIT | Yes | No | 6 November 2026 |
| ST Reborn | Completely free | Apache-2.0 | Yes | No | 9 November 2026 |
| Windows-Repair-Tool | Completely free | MIT | Yes | No | 6 November 2026 |
| WinAppMigrator | Completely free | MIT | Yes | No | 8 November 2026 |
| FurMark-Stress-Test | Completely free | MIT | Yes | No | 9 November 2026 |
| ZenithFanUtility | Completely free | MIT | Yes | No | 9 November 2026 |
| Helyx | Completely free | MIT | Yes | No | 9 November 2026 |
| Apportia | Completely free | GPL-3.0-only | Yes | No | 6 November 2026 |
| MemWise | Completely free | MIT | Yes | No | 6 November 2026 |
| FileFly | Completely free | AGPL-3.0-only | Yes | No | 6 November 2026 |
| kde-gitpulse | Completely free | MIT | Yes | No | 9 November 2026 |
| ChimbaBenchCL | Completely free | MIT | Yes | No | 7 November 2026 |
| WSLPad | Completely free | MIT | Yes | No | 8 November 2026 |
| APRSNET Desktop | Completely free | GPL-3.0 | Yes | No | 8 November 2026 |
| AppLocate | Completely free | MIT | Yes | No | 6 November 2026 |
| Battery Hub | Completely free | MIT | Yes | No | 8 November 2026 |
| Blockwork | Completely free | GPL-3.0-only | Yes | No | 7 November 2026 |
| Buf | Completely free | Apache-2.0 | Yes | No | 7 November 2026 |
| Bulk Crap Uninstaller | Completely free | Apache-2.0 | Yes | No | 6 November 2026 |
| CPU-Z | Completely free | Proprietary | Not verified | No | 6 November 2026 |
What the data shows
- 28 of 30 are open source.
- 29 of 30 work without an account (verified).
- 28 of 30 are verified usable in a work context.
Good to know
Before any repair, create a restore point or a backup. Be wary of “optimisers” promising spectacular gains: none is listed here without an official source.
How this list is built
Order: most complete free offer first (no strings, then with conditions, then limited free version), then a popularity index computed from public signals (installs in official catalogues, repository stars, presence in several sources). No position can be bought.