The Essonne department is home to a concentration of software development companies, many of which are mid-sized firms. These companies offer diverse solutions, from network optimization and workforce management to industrial IT and digital workspaces. They primarily serve business clients across various sectors.
Infovista provides data-driven solutions for network performance, while Horoquartz offers integrated solutions for workforce management. CODRA specializes in industrial IT and software distribution, and iObeya transforms workspaces into collaborative digital environments. A notable pattern is the strong presence of companies headquartered in Massy.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Infovistainfovista.com
Empowers service providers and enterprises with data-driven solutions for optimizing network performance, enhancing customer experience, and driving business success. |
834 | |||
| 2 |
Horoquartzhoroquartz.com
Provides integrated solutions for workforce management, planning optimization, activity tracking, access control, and identity management, serving over 5000 clients globally. |
568 | |||
| 3 |
MEDIA IMMOmedia-immo.fr
Provides digital solutions for generating risk reports and urban planning documents specifically designed for real estate professionals. |
200 | |||
| 4 | 181 | ||||
| 5 |
iObeyaiobeya.com
Transforms physical workspaces into immersive, collaborative digital environments for sharing KPIs, plans, and ideas, fostering collective intelligence and quick decision-making. |
156 | |||
| 6 |
Exatechglobal.exatech-group.com
Collaboration with universities and agencies to optimize and secure paper-based and digital examinations and assessments through innovative technology solutions. |
114 | |||
| 7 |
EBS Group Franceebsgroup.fr
Provides comprehensive IT services and equipment management, offering tailored software and hardware solutions to small and medium businesses. |
88 | |||
| 8 |
PI Electroniquepielectronique.com
Established in 1983, a leading cash register system company in France and globally, providing certified NF 525 SPIN MANF cash registers |
82 | |||
| 9 |
Aprovallaprovall.com
Comprehensive third-party lifecycle management platform supporting evaluation, onboarding, monitoring, and off-boarding across legal, finance, cybersecurity, and ethics domains. |
61 | |||
| 10 |
Cyriascyrias.com
Consulting and integration company specializes in assisting Purchasing and Finance Departments with implementing Cloud Solutions, offering expertise in digital transformation projects |
42 | |||
| 11 | 41 | ||||
| 12 |
EZYTAILezytail.com
Industrial supply chain management providing back office software, mutualized logistics, transportation solutions, ERP integration, and consulting for new and existing multi-channel retailing businesses. |
41 | |||
| 13 |
ERT Intégration - Groupe Kardolkardol.fr
A subsidiary of KARDOL Group, specializing in SAP BUSINESS ONE integration for small to medium-sized businesses with expertise in industry, after-sales service, and trade |
40 | |||
| 14 |
Interact Softwareinteract-software.com
This French company specializes in End User Experience and Digital Experience Management solutions for large organizations, aiming to improve user satisfaction and optimize IT assets |
29 | |||
| 15 |
Infass Systèmesinfass.com
Development of tailored software solutions for insurance, temporary work, petroleum storage, and point-to-point transport industries with specialized expertise. |
29 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Aryason Consultingaryason.fr
Massy based firm specialized in providing professional advice on computer systems and software solutions with seven years of industry experience. |
26 | |||
| 17 |
AVM INTÉGRATIONavm-integration.com
Develops software solutions, including video verbalization and security management, and distributes IP security products. Also offers customized application development and integration services. |
25 | |||
| 18 |
AMPHITRITEamphitrite.fr
Specialized in advanced satellite and in-situ data processing for maritime decision-making, offering solutions for green shipping, defense, and environmental applications through end-user products. |
23 | |||
| 19 |
DAMAaaSdamaaas.com
INAGUA offers DAMAaaS, a platform for custom business applications with no coding, enabling efficient workflow collaboration, document management, and data security |
22 | |||
| 20 |
SpinalComspinalcom.com
Develops sovereign software for building and infrastructure management. Its platform optimizes spaces, maintenance, energy, and unifies fragmented building data for smart operations. |
21 | |||
| 21 |
TELINOtelino.com
Specializing in digital transformation, TELINO offers innovative solutions for digitizing data flows, securing data, integrating with IT systems, and more |
21 | |||
| 22 |
WAVESOFTwavesoft.fr
French software publisher specializing in management software for small to medium-sized businesses in Trade, Services, and Light Industry sectors Offers nine software modules |
21 | |||
| 23 |
Simviasimvia.tech
Provides open-source numerical simulation solutions supporting industrial projects, reducing reliance on proprietary software, controlling costs, and boosting competitiveness. |
20 | |||
| 24 |
Arkangelarkangel.io
Design advanced AI-powered security platform integrating behavioral analytics, predictive intelligence, and extensive data analysis for comprehensive cyber threat detection. |
20 | |||
| 25 | 20 | ||||
| 26 |
Dir IPSdirips.com
Development of IT solutions for healthcare, social, and medico-social sectors focusing on budgeting, staffing, user tracking, and regulatory compliance. |
19 | |||
| 27 |
AFIDIUMafidium.com
Afidium provides innovative B2B solutions for businesses in the tourism sector, optimizing revenue and profitability across Europe with tailor-made solutions |
17 | |||
| 28 | 17 | ||||
| 29 |
API - Advanced Prologue Innovationapi-sas.fr
A digital transition partner specializing in electronic invoices, EDIFACT exchanges, Chorus Pro integration, and electronic signature solutions for businesses of all sizes |
15 | |||
| 30 |
iNet Systeminet-system.com
A Paris-based company offers Apple technology advice, product resale, installation, integration, support contracts, and software development services |
14 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
More company lists in the Essonne department
- The largest companies in the Essonne department 1,149
- Companies with in-house R&D in the Essonne department 198
- Multinational companies in the Essonne department 156
- Manufacturers in the Essonne department 127
- Hardware manufacturers in the Essonne department 114
- Distributors and wholesalers in the Essonne department 76
- IT Services and IT Consulting companies in the Essonne department 70
- Professional services firms in the Essonne department 68
- Public sector organisations in the Essonne department 66
- Aerospace and defence companies in the Essonne department 65
- IT services companies in the Essonne department 60
- Retail chains in the Essonne department 59
- Construction companies in the Essonne department 56
- Pharmaceutical companies in the Essonne department 45
- Electronics and semiconductor companies in the Essonne department 44
- Research institutes in the Essonne department 42
- Events Services companies in the Essonne department 41
- SaaS companies in the Essonne department 41
- Consulting firms in the Essonne department 40
- Family-owned companies in the Essonne department 38
- Contract manufacturers in the Essonne department 35
- Research Services companies in the Essonne department 35
- Critical infrastructure operators in the Essonne department 32
- Education providers in the Essonne department 30
The same list elsewhere in France
- Software Development companies in France 4,210
- Software Development companies in Île-de-France 1,992
- Software Development companies in Auvergne-Rhône-Alpes 502
- Software Development companies in Occitanie 315
- Software Development companies in the Hauts-de-Seine department 301
- Software Development companies in the Rhône department 264
- Software Development companies in Provence-Alpes-Côte d'Azur 223
- Software Development companies in Grand Est 211
- Software Development companies in Nouvelle-Aquitaine 210
- Software Development companies in Pays de la Loire 198
- Software Development companies in Hauts-de-France 177
- Software Development companies in the Nord department 141
- Software Development companies in the Haute-Garonne department 140
- Software Development companies in the Loire-Atlantique department 137
- Software Development companies in Brittany 132
- Software Development companies in the Gironde department 124
- Software Development companies in the Bouches-du-Rhône department 121
- Software Development companies in the Hérault department 107
- Software Development companies in the Isère department 90
- Software Development companies in the Ille-et-Vilaine department 80
- Software Development companies in Paris 1,413
- Software Development companies in Lyon 178
- Software Development companies in Toulouse 89
- Software Development companies in Lille 77